My 997 is Carrara White (with a dark blue interior, which some assume is just black), which I love, but I'm drawn to the Forest and Olive Greens, as well as Teal. And there are some great blues, but as Tony suggests, you need to look at the combination of interior and exterior colours, as some of the interiors look plain, and some just look awful, or just don't work in combination.
For example, I struggle with the beige (especially on a light exterior, such as the 'desert spec' white over beige), and I can't handle the light grey (I wouldn't touch it on any car - they look like old Toyotas). The 'dead whale' (black over red) can be a bit much as well.
It's easy to dismiss the silvers and greys, and then you see a Seal Grey over the peanut/mid-brown interior, and it looks great ... and it starts all over again.
But I reckon an Olive or Forest over tan looks great on a road car.