Balloons
Balloon Cakes
Buy balloons on Amazon (paid link)
Buy an air pump on Amazon (paid link)
Balloon cakes come in all kind of sizes and different shapes.
Check balloon fabric weaving page, and balloon hats, and balloon vases for more ideas for making your balloon cakes!
And check out the Balloon Candles page for your birthday cake candles.
How to make balloon cake
Balloon cake
Balloon cake