I have an acoustic with a pretty finish and I want to paint it. I yanked off the pickguard to let the whole face show through and it's gorgeous (opened the sound up too).

Now I want to paint a design over it and I was just wondering what kind of paint I should use. Any ideas?
I'd suggest taking off whatever finish is on the acoustic guitar first. From there, you can use just about any paint. It really depends what look you are going for.

You can use acrylics, car paint, latex paint, water colors, body fluids, etc.

Oh, and taking off the pick guard probably didn't open up the sound. But as long as you think it did in your head, congratulations!