How old is your bunny?
Some ideas that my bunnies like (they are 6 years old and lazy, not big on play):
-Get one of these treat balls made for cats. You put a small treat in it, set the dial so they have to work to get the treat out by pushing the ball around. Olivia has become very clever with getting the treat out! I use a piece of dried papaya which works well. You can buy these balls for a couple of bucks at Walmart.

– Olivia loves stacking cups made for babies. I stack them up and she loves to knock them down.
-Olivia also likes to play with a deck of cards. I fan them out and she pulls the cards out one by one.
-Some bunnies prefer food-motivated toys. You can make a treat bag with a brown paper bag, fill it with hay and healthy treats (only a small amount) like bunny-safe dried flowers, dried fruit, pellets, etc.
-And all bunnies love a cardboard box with a door and windows cut in it!