Not long ago I decided I really needed to up the cool factor to my son's bedroom. It had always just been a plain old blue. He has always loved Mario so we decided that would be a good theme to go on. I had seen the wall clings but they just didn't quite fit what I was looking for. We needed something bigger that tied in more of the room. I finally stumbled on the idea of just painting it right on the walls. I decided if all else failed, I could just paint back over it again. He started playing SNES Super Mario World when he was 5 and loved it even though he quickly beat it several times. So I thought that would be a really cool retro theme for his room. Plus its totally unique and cool as well as being simpler to do than the new high-res Mario. I tried to take some pictures through the process that I will use throught this Instructable. Hopefully this Instructable will give you some ideas and tips to help you along. I didn't track it but I spent probably $30 - $50 on this project and probably spent a good 15 - 20 hours working on it off and on for a couple months. Pretty much the only cost was on the Home Depot sample paints, they were perfect for this project. I used the Behr and Gliden 8oz sample paints that are tintable to any color you can find for about $3 or $4 each. I did opt for the quart size for the green because there was so much of it and I didn't want to run out.
Optional but VERY helpful: