Being a Half-Life, and most recently a Portal fan, I decided to create some game themed “corporate” mobile wallpapers for my new Nokia 6303 cell phone (and also to celebrate my first phone to have a display with colors!). I aimed for streamlined, well visible, but at the same time unobtrusive images that will work well with the Symbian UI.
Just save one of these images onto your phone and then in Menu->Settings->Display set it as your wallpaper. Enjoy! :)