Wow, today I learned, in 1942 the Redskins had blue in their uniforms.
http://www.gridironuniforms.com/redskins.html
As far as he alternates, we've had throw backs of the very early years (plain burgundy helmet), the late 60's Sonny years (spear), the Lombardi years (yellow "R" McDonalds unis), I think we are gonna go with a version of the 59-64 feather helmets....which personally I love.