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!
Why not enjoy the night sky with some blankets that feature a crochet star pattern? Luckily, The Crochet Star Pattern: 28 Patterns for a Starry Night is here to provide a plethora of crochet stars for you to enjoy.