Great idea to make a mobile. Supplies needed: 216 Sharpies, clear plastic cups, hole punch, string/ribbon. 1) Color the cups with the Sharpies. 2) Place the cups on foil sprayed with Pam. 3) Melt the solo cup in a 350 degree oven for 3-4 minutes 4) Immediately after taking them out of the oven, pat them down to completely flatten them and make hole if desired.