Blue and red are the most appealing to me initially, however white strikes a nice balance between sporty and easy to keep clean. On a weekend sports car that I can stick in the garage, it would have to be something bright and obnoxious.
For those of you who love purplish cars....I once saw a gorgeous used Cayman S in Carmona Red Metallic, a deep maroonish color with a hint of red, with upgraded Natural colored leather (dark tan) for sale at a local dealer. Stunning combo, heavily optioned car, but they had to lower the price several times to find a buyer.
2012 Porsche Carrera 991
Voted for blue since that is what I have, but I also like white, silver, and gunmetal. The other colors tend to work some times but not others, and I really like unique colors.
I don't understand why cars aren't offered in more colors, especially stuff like M3's and R8's and whatnot. I can see making a lot of them special order only, but at least have them available in the configurators.
A Fiji Green R8 would be excellent.
Wanganrunner's Corvette post.
I have a car painted in the bright aqua. I have owned black, white, orange, red, yellow, blue in varying shades, green, purple, dark grey, and tan. I cannot stand silver because it looks like cheapened metal. Raw metal (stainless steel) is OK, but not a copy of it.
I keep thinking I want a dark-colored car for the next one. Maybe a rich chocolate brown? It depends on the day. Maybe that's why I have various colors.
Bright blues are my favorite. I love things like Aqua Blue on recent Porsches, Cobalt Blue on previous Porsches, Sky Blue, Celestial Blue, and Winning Blue on Mazdas, and Grabber Blue on the current Mustang.
That said, if a car is unavailable in blue, or is only in a particularly dark blue, I do also like wine/subdued reds. My current car is "Sangria Red," which is metallic and not dark... somewhat in the middle of the dark/light progression.