I might have to get a pair.
Peanuts x Vans
David Brownings' Paper Shoes. Have him make a custom pair for you.
Not sure if you would wear these out in the rain, but pretty cool cardboard shoes if you asked me. I found these on Lost At E Minor.
If you missed out on my other cardboard posts here they are again:
PJ Blands Cardboard Food
etsy: cardboard