You will need:
-Tan leather sandals (similar here)
-Acrylic cabochons with prongs in black and white (or your desired color) (similar here)
-toothpick or matchstick for gluing
Begin gluing cabochons from the center of each sandal as shown.
Continue gluing, attaching each cabochon in desired pattern.
Finish attaching all the cabochons. Let dry for 8 hrs.
First image via here, the rest by DC2NYCo