I did a little research and found a bunch of ways to reuse your old, tared, lots 'o runs pantyhose.
Step 1: Arm Tattoos
I tried this and tried to trick my roommates. I drew a flower on the pantyhose then put it on my arm. When I showed it to each of my roommates they were like, "thats great you drew a flower on your arm....". When I pulled down the pantyhose they were like, "WOAH I TOTALLY THOUGHT YOU DREW THAT ON YOUR ARM". True story - and it worked on 4 different people!