As a counterpoint for practical (i.e., performance) mods being the only mods that matter... I have a F82 which has a few carbon fiber parts to make it stand out a bit. I really don't think I need more performance than what it has to offer, so making it look nicer seems like e a good idea (at least it won't look identical to all other F82s).
Now, would I do that to a Camry? No freakin way.