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!
Easter garland bunnies and chicks pompoms
DIY pom-pom bunny -- need ideas for Easter party at school. Maybe the kids could handle this if they just have to glue together the pieces for the bunny.
Paper Strip Easter Egg Art for Kids Could do this with any shape. Hearts for Valentines, Shamrocks for St. Trees or ornaments for Christmas. Well, you get the idea.