I'm quite partial to the way my Lamborghini Aventador looks with the aero kit A installed (White Car / Black Aero Kit plus Black Wing - Custom C). Yes, I am a bit biased - I love Aventador's.
Hmmm this existing thread might have been better to look through before starting a new thread? There are lots of images showing the range of bodykits and accessories available across most of the premium cars in the game...