For me, this was the best one by far:
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As much as I despise this game, it had ONE excellent thing I wished subsequent console games had: Paint Booth. I"ve lost track with how much time I spent with that feature (I literally have tons of videos worth of stuff I made). For those that aren't that handy with Painting or photoshop, you had the simple in-game tools that worked great and were easy to use. For us that really wanted to take it to the next level (and were good in photoshop), there was the ability to download templates, create your paint scheme, upload TGA files and download them from your account in-game. Turning your completed flat:
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into a full car:
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Here's several examples I made rendered in a 3D Program:
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I believe there is a thread here somewhere with one of them, which inspired someone to make a version for Forza
I really wanted this in PCARS, but of course that didn't happen
Clearly it can be done on consoles so I can't understand why, even with the current gen ones, it hasn't been done since.