I know it sounds fearful, but try full face designs, there a lot easier than you think. I started with cheek art, but now do mostly full faces, it's quicker, gets a big effect, and the kids really love it. If you check out
Silly Farm Supplies Inc. - face and body paints and face and body painting look at the lower section were it says videos, they post 2-3 how to's every month on different designs.
I haven't tried the glitter tats. yet, but I did by soem reg. tattoos, either I got a bad batch, or they don't do well in extreme temps.