One thing my Syrian likes is a “treat box” made from a cardboard toilet paper roll. To see how it’s done, take a look at the first suggestion in this YouTube video:
https://www.youtube.com/watch?v=tVCWXrg6CwE
(If the link doesn’t work, search “Melody Hamster DIY” and it should bring up a video about 3 easy DIY hamster toys. And there are other ideas on the Web as well.)
Good luck!