These are my Morrigan tights, I haven't finished the rest of the costume yet (lol) but I thought I would post progress pics.
The stencil I made is just the Batman symbol I googled on the internet and printed out, lol. Her artwork changes with almost every picture so I just picked one I liked. I cut it out and glued it to a thin piece of cardboard, and then cut it out with a box cutter. Then I saran-wrapped my legs, and put my tights on over it, so I wouldn't dye my skin. I bought these tights for $5 from Target, btw. Then I had my mom draw in the stencil on my leg with a fabric marker (haha she had to help me a lot with this, since I couldn't reach) and then I filled in the bats with the marker. Afterwards, I took them off and filled them in without me wearing them. When they shrink down to their normal size, it is much easier to see where you have missed spots. You can see me wearing them in the last photo, but this was before I took them off again to touch them up, so some of the bats may look a little shoddy. But they look pretty good afterwards!