Depends on the bunny
For a rabbit that likes to throw and shake things baby keys and rattles are good. So are cardboard tubes, bunny toss toys, and wooden spoons.
If the rabbit likes to dig or shred then old phone books, newspaper, and straw mats are good. You can even make a digging box full of hay and shredded paper with some hidden treats.
For a bunny who likes to chew wooden toys are good but I've found they aren't the most popular. Instead try willow toys and baskets. Cholla chews, apple branches, cardboard, and balsa wood toys are also favorites.
Rabbits that like to climb, explore, and hide love boxes and cardboard bunny mansions.
Some rabbits love puzzle-type toys like Nut Knot Nibblers, Wacky Wabbit wooden alfalfa cups, plush treat holders, kongs, and treat balls. Those are good since they keep rabbits busy.
Almost all rabbits love toilet paper rolls...fill one with hay and a treat and then bend over the ends. Keeps them entertained for a while
. You can also take a brown paper bag and fill it with hay and treats. Then twist it closed...rabbits go nuts destroying them to get the hay and food
Oh, and some bunnies like to roll or nudge toys. So balls with bells inside are good. There are a lot of good plastic cat toys that roll.
Edit: I forgot...some rabbits even play tug-o-war
. Small rope dog toys are good for that. Some bunnies like stuffed animals, too.