You can paint or spray a guitar or apply woodcutting techniques but you can also simply use Sharpie permanent markers. They call it "Sharpie a guitar". Now this has been and still is popular among certain creative minds. You can find videos on You Tube called "How to Sharpie a guitar".
A Red Special "64 Special," also offered by RS Custom Guitars in the unique "washed out green" finish. I've seen so many photos of the original Red Special over the years that I'm not even sure I'd notice this was considered a green finish if there weren't photos of other colors with which to compare it.