Ok I got a little carried away with the mockup thing lol, but heres the pics. Im gonna upload 2 PSDs one thats simple with only the art and one that has the different color buttons. Only photoshop you really need is how layers work since its just hiding stuff in folders.
The actual mockup picture is much bigger than what you see below it comes out at 856 x 690 so its a nice size for the web. I shrunk it down so i could show different styles.
I used Raging spaniards El fuerte art, Modus art (guy with the rocketpack) and the wallpapers in the OP.
Here are the links
Mock up with colored buttons, stick and clear colored sticks.
http://tinyurl.com/cqupnx
Simple Mock up - No colored buttons, joysticks or clear sticks. Just paste your art on top of the ART layer.
http://tinyurl.com/cgryp3