This was so much fun to make! It was done as a first birthday smash cake. It is a 6-inch round, with a 3-inch ball-shaped head. It is frosted in buttercream, but all the black elements (dots, eyes, antennae, etc...) are fondant. 
This is becoming a popular cake! I used tip 21 pull-out stars on this one, and really like the effect better than tip 18. I used tip 12 to make the teeth and claws. I heated, stirred and poured the icing on to the cupcake-eyes to make them super smooth. the cake board was thinly "iced" with corn syrup (for sticking power!) and covered in graham cracker crumbs to look like sand. Note to self: writing in icing on "sand" is almost impossible! Everytime I picked up the icing tip at the end of a letter... the sand would lift off, bringing the letter with it... stick to writing on the cake or cake board! This cake is cut from 2 1/4-sheet cakes... it serves at least 30.... I need to work on scaling it down to one sheet cake to serve 10-15, I'm just not sure how.
This was a fun cake, and I love the summery colors. This is an 8-inch round on a 12-inch round, decorated entirely in marshmallow fondant, with buttercream "water" at the bottom of the slide. This cake was inspired by a picture found on cakecentral.com