These took me about a week to make: Custom Justice League of America shoes!
All I needed was 1 pair of vinyl shoes (about $25), three issues (#8, 9, and 10) of DC's New 52 Justice League, and a bottle of ModPodge. It was probably about 8 hours per shoe, in blocks of 2-3 hours or so. What took longest was positioning the specific character images and sound effects splashes, and trimming them to fit.
I cannot WAIT to wear these!