We used to do one of these every month. Do a search for photoshop competition.
Basically someone posts a high res car image (doesn't have to be a fiat) and then everyone mods that image.
Every1 sends the pictures to whoever is in charge and they post them on a POLL thread for a week. The winner is the person with the most votes and the winner gets to choose next months car.
If you wanna start one up I'll find a decent image and run the 1st one?