Yes. Your sticker project can have a unique shape. Custom Die Cut stickers come in 3 basic varieties: Kiss cut, Contour Cut, and Die-Cut.
Kiss Cut stickers are a traditional looking printed sticker available full color with a peel-away backing paper.
Contour Cut stickers are where the decal is cut to a basic shape and the backing paper remains square for easy peel-away.
Die-Cut stickers are a solid color vinyl with no backing.