I tried to make a phone "wallet" case. I used the inside of my old one (what you press your phone into), cardboard from a an old box and some leftover vinyl flooring. I originally wanted to glue everything but ended up stapling some bits. these pics where hastily made and don't do the thing justice.
Let's see how well this holds up (I seldom have it in my pocket so that helps).
It's nice. I'm use to customise the transparent case that come with the phone by cutting reused printed paper in the form of the case and placing it in there but I never made a case myself.