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 is called Sekka shibori which is one of Itajime Shibori dye techniques. It's created by pleating, folding, clamping and dyeing the fabric. The fabric has to be folded and pressed neatly to create nice and precise patterns.