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pool party Beach Party Cake - cute for the adults and then maybe cupcakes for the kids

Beach Party Birthday Cake

Elegant looking aboveground pool cake is surprisingly easy to decorate!

Pool/lifeguard cake?

Rob's "60 not out" cake! by Torki's Sugar Art, via Flickr

Swimming pool

Swimming pool — Birthday Cakes

Octopus Birthday Cake by The Sugar Syndicate, via Flickr

3D Swimming Pool shaped Wicked Chocolate cake decorated with 3D swimming figurines by Charly's Bakery, via Flickr

Wicked Chocolate cake iced in sea blue butter icing, decorated with 3D waterslide with 3D boy figurine in Barcelona FC t-shirt & bright fondant stars by Charly's Bakery, via Flickr

Learning to swim cake by Crazy Cake - Cakedesigner57, via Flickr

Swimming pool cake by Little Sugar Bake Shop, via Flickr