What are your interests?  Do you like canoing, hockey, soccer or what?  Do you do anything other than Mod and build computers, and play games?  If you have a favorite game, use it as a theme. Hockey, how about a scene showing a puck hitting the net, and an 80mm fan in the center of the puck.  You gotta do this one, but we will praise or razz you about the results when you post pics. ;D