There are so many things you can do with stuff around the house. I love cardboard in so many shapes and sizes because it is safe for chewing and very versitile. Boxes of various sizes to go under and over, I weave flat pieces of cardboard through the pen bars for them to chew and dig at. Flat pieces on the floor for digging. Toilet paper or paer towel or wrapping paper tubes plain or stuffed with hay are great fun. Phonebooks without the covers are great for digging and tearing up.
If you go to the craft store you can get dowell rods and end wooden pieces to make little dumbells. I use bells and sissal or hemp rope to decorate the middle bar to make it more interesting. Elmers school glue is safe to put things together.
Hard plastic baby toys are great, particularly rattles. Cat toys, such as the hard plastic balls with bells are also a hit.
Basically everywhere I go I think about bunny toys. Look around with an open mind to see if you can repurpose items to your bunny's liking. Only a small fraction of my kid's toys were sold for rabbits.
