Spray paint: rubber door mat with a primer (any light color), base coat with black (allow dry time between coats). Use two coats of the Matte Heirloom White, allow a few days airing time outside. Use 120 grit sand paper on a small hand sander, sand to distress/aged feel.
Rubber Door Mats pressed into a concrete mold and later removed, to make stepping stones! There are lots of other fabulous concrete projects on this page! I'd like to take the one on the bottom left & cut the mat in half first before making the mold. Gigi