Pretty adorable hay rack/litter box combo.
Having a top to your hay rack will discourage your bunny from jumping into the rack AND provides an awesome ledge to hang out on!
If your bunny isn't too much of a plastic chewer, this is a great set up!
Hay tower! If you make this, make sure to secure it to a heavy wood board, so it doesn't fall over while bunny is enjoying his/her hay.
A hay tunnel! The bunnies that have persuaded their owner to make/buy this for them are truly well loved and spoiled buns!
A fun, simple basket style hay rack! You could surely do this your self with very little effort.