oh how exciting Rhian nearly there
Do you have a camera to take a picture at all? Can you see a brand name or anything in it? The traditional toilet / kitchen roll tube always goes down well or you can buy animal safe parchament versions in larger sizes.
Plus you can buy Plastic Puzzle Playgrounds
in various sizes and combinations from many good petstores on online.
There are also wooden toys such as these or Hagen do a great range of houses, treasure chests etc with holes in them for your hamter to explore around in.
You get various toys for keeping teeth in trim as well
There really is no limit if you have a vivid imagination
Eggboxes made from 100% recycled board are a firm favourite in my house. It doesn't need to be expensive to be liked thank goodness. My other-half is a dab hand with a drill and a coconut - you can make houses and little hanging swings from these.