exterior mods

i was wondering if anyone out there knows of a website or software out there that i can see what mods will look like before i do them. kind of like the one they use on the fast and the furious. i want to see different colors, ground effects, hood scoops, lowering, rims, etc. i went to thetirerack.com and they let you see different rims on your car, that was kool but the car color choices were limited.