http://img.photobucket.com/albums/v...ingfield-15.jpg

http://img.photobucket.com/albums/v...gThunder-05.jpg

http://img.photobucket.com/albums/v...ecisions-03.jpg

In the comics they used to depict it in a sort of "greyish blue" althoug sometimes it looked more of a dark dull blue, or a violet-gray blue.

It's a really difficult one to find out But anyway, blue must be the base.