You can use any shape. It doesn't have to be a bunny. Just trace a shape or cookie cutter. This would be cute for any holiday, just use an appropriate cookie cutter to trace and cut out the shape, then whatever yarn works best for that holiday!
This website isn't in English so I'm not sure what's happening, but it appears that I can copy this pink pattern and the matching aqua one for free to make oven-shaped boxes. I might have to resize them for a cupcake.