Yep... open Genesis to where it says, "And G-d said let there be more pixels, and there were more pixels and G-d saw this was good."

Or....you can open Photoshop and use the Sharpen/Sharpen more in the Filters tab.

Or, find the add on "Alien Skin Blow Up" for Photoshop and use that...

If you use it as a wall, hide all your desktop icons, docks, etc. and your taskbar and then (if it's clear enough) take a screen shot and save the screenshot as your wall.

Try doing a image search for that wall and you might find a better shot of it. Not sure what animation that's from but I'd search under that name. I tried sharpen as well and your right...doesn't help.