Just something I spent like 10-15 minutes on.
http://lurkerpatrol.deviantart.com/art/Kawasaki-Ninja-wallpaper-83223153
1280x1024
http://lurkerpatrol.deviantart.com/art/Kawasaki-Ninja-wallpaper-83223153
1280x1024
Small technical issue I see here. People with a taskbar, won't really be happy about the fact that 1/2 the bike will be hidden by it.
You might want to add ~30pixels (or whatever the size of a windows taskbar is) to the bottom, obviously not blank color but something suiting the overall design.
PS: it will be also more appealing imo, fitting better the rule of thirds.
I was expecting a totally blank image. Y'know, ninja wallpaper. It hides.