Woud like to see some green on Fed as well, especially slightly dark green but not as dark as the sail green. For RG, blue and white maybe, haven't seen him in that color scheme during RG before.
Nadal:, don't really care, purple and white maybe for the clay season maybe, and head to toe anthracite for RG.
Fed was in blue and white for French Open 2004, 2006 and 2010. Rafa wont be in purple because he will be wearing purple at the Australian Open.