Planning a SpongeBob-themed birthday party? The most popular designs usually include classic SpongeBob face cakes, pineapple house cakes, and fun underwater scenes inspired by Bikini Bottom.
This guide pulls together a variety of creative styles so you can find the perfect design kids will instantly recognize and love.
SpongeBob Cake Ideas (Organized by Theme)
Below you’ll find a mix of SpongeBob, Patrick, Pineapple House, and underwater-style cakes. Each idea can be customized to match your party colors, age, and your child’s favorite characters.
1. Classic Round SpongeBob Face Cake
This tall round cake is covered in bright yellow buttercream with a large SpongeBob face on the front, complete with cutout arms for extra personality. It’s cheerful, bold, and instantly recognizable.
Why it Works
- 3D shape delivers a wow factor
- Perfect for photo moments
- Fun bubblegum detail adds humor kids love
Customization Ideas
- Change the prop, balloon, jellyfish net, or party hat
- Add fondant sea elements around the base
- Use bright candy inside for a surprise when sliced
2. Sitting SpongeBob Fondant Cake
A 3D fondant SpongeBob sits front and center, blowing a playful bubblegum bubble. His square shape and little shoes make the design lively and animated. This sculpted style looks like a showstopper straight out of the cartoon.
Why it Works
- 3D shape delivers a wow factor
- Perfect for photo moments
- Fun bubblegum detail adds humor kids love
Customization Ideas
- Change the prop, balloon, jellyfish net, or party hat
- Add fondant sea elements around the base
- Use bright candy inside for a surprise when sliced
3. Two-Tier Pineapple House Cake
This cake features a top tier sculpted like SpongeBob’s pineapple house, with the bottom tier decorated in soft blues to mimic an underwater scene. Seaweed, bubbles, and coral give it texture and dimension.
Why it Works
- Instantly iconic pineapple shape
- Great mix of sculptural and classic cake formats
- Works well for larger parties
Customization Ideas
- Add windows and door details to the pineapple
- Include character toppers near the base
- Customize the underwater colors, pastels or bold neons
4. Four-Tier Character & Underwater Cake
A tall, dramatic four-tier creation featuring Patrick’s face on a pink layer and SpongeBob’s on a yellow bottom tier. This cake blends character fun with detailed world elements.
Why it Works
- Stunning height for big celebrations
- Combines multiple favorites in one design
- Each tier feels unique and exciting
Customization Ideas
- Swap characters between tiers
- Add edible glitter to underwater tiers
- Choose a different flavor for each tier
5. Single-Layer Underwater Buttercream Cake
Description:
This simple yet charming cake features soft blue buttercream and plenty of underwater accessories, bubbles, coral, shells, and sea plants. A SpongeBob topper on the surface adds the finishing touch.
Why it Works
- Beautiful, soft textures from buttercream
- Easy to customize with accessories
- Works for minimalistic party themes
Customization Ideas
- Add pastel or sunset-colored ocean tones
- Include more characters like Gary or Plankton
- Optional metallic shells for sparkle
6. Character-Eyes Round SpongeBob Cake
A round yellow cake with oversized SpongeBob eyes and outstretched hands creates a fun, animated look. The bold facial features make it feel like SpongeBob is popping out of the cake.
Why it Works
- Big eyes grab attention
- Simple but high-impact design
- Great option for quick photo ops
Customization Ideas
- Add a party hat or number topper
- Personalize the facial expression
- Use ombre yellow buttercream for depth
7. Two-Layer Patrick-and-SpongeBob Cake
This cake pairs Patrick and SpongeBob perfectly, Patrick’s pink smiling face on the bottom tier, and SpongeBob’s cheerful expression up top.
Why it Works
- Combines two favorite characters in one
- Great color contrast (yellow + pink)
- Works for siblings who love different characters
Customization Ideas
- Add jellyfish or bubbles between tiers
- Change facial expressions to match party mood
- Add side figurines for dimension
8. SpongeBob Shaped Sheet Cake
A classic sheet cake carved into SpongeBob’s full silhouette, then detailed with bright fondant features. It’s nostalgic and instantly recognizable, making it ideal for fans who want a retro cartoon feel.
Why it Works
- Easy to serve at large gatherings
- Classic character shape
- Great for cost-effective decorating
Customization Ideas
- Add accessories like a jellyfish net
- Swap fondant for buttercream piping
- Add themed candies on the tray
9. Two-Layer Fondant Bikini Bottom World Cake
This detailed fondant design features two layers decorated with mini-scenes from Bikini Bottom, coral caves, jellyfish fields, and ocean plants. It’s perfect for kids obsessed with all the little details.
Why it Works
- Easy to serve at large gatherings
- Classic character shape
- Great for cost-effective decorating
Customization Ideas
- Add accessories like a jellyfish net
- Swap fondant for buttercream piping
- Add themed candies on the tray
10. Round SpongeBob Face & Arms Cake
Another playful take on the SpongeBob face cake, this version features extended fondant arms that lift upward or outward. The personality in the pose makes each cake feel unique.
Why it Works
- Expressive arms create movement
- Kid-friendly design with lots of energy
- Perfect for simpler party setups
Customization Ideas
- Change the arm pose for fun gestures
- Add a small fondant jellyfish to one hand
- Personalize the border colors
11. Pineapple Cake with SpongeBob Cutout
A cake shaped and textured like a pineapple house, complete with a cute SpongeBob cutout at the base. It’s tropical, bright, and perfect for summer birthdays.
Why it Works
- Easy recognizable theme element
- Great for outdoor or poolside parties
- Vibrant sculpted texture
Customization Ideas
- Add the house’s porthole window
- Include sea plants around the base
- Add edible sand made of cookie crumbs
12. Underwater Scene with SpongeBob & Patrick
Why it Works
- Perfect for younger kids
- Bright, friendly characters on top
- Quick design with lots of visual impact
Customization Ideas
- Add jellyfish or sea plants
- Use piped coral in neon colors
- Personalize with a name banner
13. Buttercream SpongeBob Face Cake with Crew
A single-layer cake decorated in blue buttercream with coral, bubbles, and seashells, topped with SpongeBob and Patrick figurines. It’s simple but full of character charm.
Why it Works
- Buttercream texture feels soft and inviting
- Group of characters adds instant fun
- Great for character-loving kids
Customization Ideas
- Choose between piped or fondant facial details
- Add a border in SpongeBob’s shirt colors
- Include themed sprinkles for extra color
14. Fondant SpongeBob Face Cake (Detailed)
A polished fondant SpongeBob face with sharp, clean details, defined teeth, perfect eyes, and structured edges. It’s ideal for parents who want a crisp, professional finish.
Why it Works
- Smooth, cartoon-accurate details
- Great centerpiece for any table
- Photo-ready from every angle
Customization Ideas
- Make him wink or smile differently
- Add a themed fondant border
- Choose bold or pastel colors for accents
15. Buttercream Pineapple Cake
A buttercream version of SpongeBob’s pineapple home, with textured yellow piping and a leafy green top. It’s softer and more whimsical than the fondant version, perfect for a cozy party feel.
Why it Works
- Natural, warm buttercream texture
- Tropical and playful
- Works with any color palette
Customization Ideas
- Add flowers or ocean accents
- Include a small SpongeBob topper
- Flavor the cake with coconut or pineapple
How to Choose the Right SpongeBob Cake for the Little Ones
Picking the right SpongeBob cake starts with your child’s favorites. If they love SpongeBob himself, a classic face cake is perfect. If they like the whole crew, choose a design with Patrick, Squidward, or an underwater scene.
● Start with your child’s favorites: SpongeBob face cakes for classic fans; underwater or full-crew cakes for kids who love all the characters.
● Match the cake size to the party: one-tier or sheet cakes for small groups; two-tier or sculpted cakes for larger celebrations.
● Choose buttercream for a soft, simple, budget-friendly design; choose fondant for clean lines and detailed character features.
● If you need something easy to transport, stick with round cakes or simple underwater styles.
● Pick the design that fits your child’s personality and your overall party vibe.
Want More Birthday Inspiration?
Still exploring themes? Here are a few other cakes kids love:
- Roblox Cake Ideas — Everyone wants this
- Super Mario Cake Ideas — great for little gamers
- Toy Story Cake Ideas — perfect if they love Woody, Buzz, and bright, colorful themes
- Minion Cake Ideas — silly, fun, and always get a laugh
Here are plenty of other character cake ideas to help you find the right fit:
See More Birthday Cake Designs & Ideas →
