I know the pix are a little hard to see but here are a couple of our cage set ups. I change them as often as I can and replace things that are soiled. cewed beyone use.
This one has a shed (it was used for weanling bucks and I find its best not to give them something completely enclosed) and walk way made of popcicle sticks. I have a tennis ball on a rope chew toy strung up with twist ties (OMG did they love that ball!) There is also a chain of plastic hearts (a party favor to make necklaces and stuff) they they can crawl up and through.
Thisone has an infant chain made of thick plastic that i found at a flea market for 25 cents. There is a rope and canvass dog chew toy that I put up with twist ties, it swings and rocks when they climb on it (this has been the bigest hit of all the toys!), I have whiffle balls that I cut large holes into hanging at differnt levels (they love to get into them to curl up and play king of the mountain on them) There is also another rope chew toy with a large knot in the middle. The knot provides a rest spot and when more than one climb about on it it swings and sways.
I dont think they can be seen in the pix but there are also cat toy jingle balls (mesh balls with a little bell in them) both hanging and onthe ground. They love these too! When I am not feeling very creative and for some of the older mice who dont fancy all the "toys" anymore I will also use branches (after baking them int he oven) and unusual rocks I find to give thema more natural feel. I like to place a slightly rough rock in areas they frequent as it helps to keep nails trimed.
I love looking at all thebird toys our local pet shops sell. I wish I could afford to buy tons of these but all the ones I think the mice would enjoy are just so expensive! I would love to take the ideas I have seen on a lot and build my own.