I’ll share my experience with my bunnies and toys, without knowing your bunny and what all you’ve tried it may not apply or help much, but maybe it will help some!
When I got Kate and Spence I don’t think they were really accustomed to having toys, they’d spent several months in a shelter where they didn’t have anything but each other and a litter box, and I suspect that they hadn’t been treated all that well by previous owners (they’d both been adopted and returned to the shelter a couple of times). When I gave them toys they sat on the ground of their pen for quite some time until one day I picked up their straw ball and tossed it a couple of times very lightly and a few times a day. Spencer got the idea after a few days and started picking it up and throwing it. I held up a willow chew toy in front of his face and he grabbed it, chewed it and threw it. Eventually he started playing little tossing games by himself. It took Kate a bit longer, but she eventually warmed up to the idea and now they play little toss games with eachother and when I’m really lucky (and have given them yummy bananas recently) they’ll play with me. They also play bunny soccer, and bunny basketball (somehow they throw a ball inside a straw mini tunnel that they turn upside down!) They also get really crazy if I toss one of their toys inside the little straw hidey house they have in their pen. That usually leads to a game I call “one of these things is not like the other” as they attempt to pull a round ball out of a square opening in all kinds of crazy ways. So it took a bit of time but they are now very creative with their game playing.
It usually takes them a little while still to decide that new toys seem like fun things to have, but after a week or so they have a grand time with most things that I get now that I have a sense of what they like, and they know what they like to do with toys. They are very picky, they don’t like small things so little willow sticks, small pine cones, even treat cubes go pretty much ignored. They do however very much like baskets, bigger toys made of braided sticks, straw balls, tunnels, jumping on and eating their straw house, and my boyfriend’s DVDs (but that’s a whole ‘nother issue!) They actually seem to prefer some of the toys I’ve bought, in fact they often pee on things like cardboard toilet paper/paper towel tubes. So I guess my story comes down to that my bunnies needed some encouragement, time, and very specific toys.
I hope that helped a little bit, obviously my story is pretty specific to my bunnies, but maybe something in there can be altered and applied to your bunny!