Perhaps completing a room with a very long Mario level poster is the ultimate in geek chic for your home or studio.
The Mario poster by Pacmania on Etsy is 15 feet long, and it details the entire first run of level one in the game. Everything is there, from the finishing flagpole and question boxes to all the different Goombas you'll meet along the way (a personal favorite!).
Sadly, it's only 12 inches tall, so it's not large enough to take up your entire wall, but it would make a really cool border all the way around your gaming room or a kid's room. It's also not a bad price at $40, but there are only a limited number of them. If you are looking for something to use as actual wallpaper though, you could always decorate with a few Mario decals.