Fun things for cage?

I fear my boys’ cage might have gotten a bit boring for them. They’ve always been sleepy chilled boys who really only get up to eat hay or drink but we would sometimes get a popcorn from them but now not so much. What does everyone have in theirs? Photo of current cage setup!

I fear my boys’ cage might have gotten a bit boring for them. They’ve always been sleepy chilled boys who really only get up to eat hay or drink but we would sometimes get a popcorn from them but now not so much. What does everyone have in theirs? Photo of current cage setup!