My rabbits all like unpeeled willow. You can buy willow toys and baskets from some pet stores and give those to them - they're always a hit with all three of my bunnies.
Apple branches are good too. Again if you get it unpeeled, or with the bark still on, a lot of rabbits seem to like peeling the bark off.
With apple and especially willow (and other woods too) make sure they are untreated. For that reason I always make sure to buy them from pet stores, even though some other stores sell willow baskets, but you don't know what kind of nasty stuff they could have been sprayed with.
And like moonchild said, make sure your rabbit always has access to fresh hay. Chewing on the hay helps to keep their teeth short.
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