Tissue boxes are perfect homes/chew toys! Whichever your hamster chooses to use them for. I had one hamster who lived in her cracker box until I would throw it out and give her a new one but most of my hamsters, chew them up with the greatest enthusiasm!
Just one word of caution though. If you have your hamster(s) in an aquarium without a lid, make sure they can't stand on the box and escape! That I learned from experience!
Hamstermama