Not really a photoshop, but my friend drew every Ferrari F1 car ever (besides the ones that were used in multiple seasons) and put it into a wallpaper. He's on Twitter @TheSuff if you're interested in more random design stuff - if you start using it as your wallpaper - I'm sure he'd appreciate a quick thanks there!
You can download here in a couple of versions - with and without car names. Both come in 2560x1440 resolution.
Without car names
With car names
Here's a preview of both.
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