Windex, paper towels, acrylic paints in the desired colors, skinny masking tape and a sponge brush. you'll also need a bowl to put your paint into.
use a dabbing motion to apply the paint to the window.
you could fill in the clear areas in the pattern by painting them black, but i like to leave them clear.
as an added bonus, they throw a very cool light and shadow pattern onto the ground outside at night!
i like the blotchy effect of sponge brushes and dabbing-you may like a smooth appearance. if so, simply substitute a soft, long bristled brush for the sponge brush.
and think of the possibilities during holidays!
best of all, if you grow tired of them, they're easy to remove with some Windex, a razor blade and paper towels.
i hope you enjoyed my new instructable, and have fun!