I started off with a pair of dyeable shoes I got from eBay. The fabric is a matte sateen, which is more durable than shiny satin.
I used food coloring for the dye, add 5 drops or so to 1/4 cup of water. Test the color on a paper towel first.
The colors will blend together nicely if you work quickly enough. Have napkin ready nearly to wipe off any excess dye that might drip off.
With shoe clips inspired by Irregular Choice .