I got tired of making mocs every time I turned around (or so it seemed), so I made a pair out of brain tanned elk hide and stitched thick buffalo hide soles to'em. Now when the soles start to wear out I just replace'em.
The mocs themselves have lasted for quite a while that way.
The thick buffalo hide soles can make for some exciting slippin' and slidein' on dry grass when they get "shined up", but are nice for walking on small rocks and stuff.