To make the tray:
1. Using craft glue, stick hotel key cards to an unfinished wood breakfast tray in any pattern you like.
2. Coat the tray and cards with an unsanded powder grout (sanded grout will scratch the keys). Let it dry, then wipe it off with a damp sponge.
3. Cover the grout and cards with painter's tape and coat the legs and sides in purple.
No grouting tools? Use an offset kitchen spatula or your fingers.