Greg, as Paul mentioned above, I've always just toured the new car yards and kept on eye out for vehicles driving on the street when choosing colours.
There are just so many great colours on new cars these days that in some ways it makes it all the more difficult when choosing colours.
And so many great colours posted in this thread.
I've always struggled with paint colours and never actually make a final decision till right before the paint is applied to the car.
Good luck with it.