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".
I love the music I listened to when I was a teen..I indiscriminately listened to everything. I didn't wonder or care if the singers performing would like me in real life, I didn't need to relate to it, it didn't even have to make sense as long as I was singing along Music was pure and simply magical.