Arrange cupcakes in a circle on a 12-inch round cake board or large platter, leaving a 3-inch hole in the center.

Frost all cupcakes with blue buttercream using a small offset spatula for a slightly wavy look.

Dip marshmallows in chocolate frosting and press an eye candy on each; set on top of every other cupcake to form octopus heads.

Cut gummy worm halves lengthwise and tuck eight halves around each octopus head to make tentacles.

Sprinkle shredded coconut around the base for “sand” if you like.