Wow, I'll look through 'em.
I chose the colors mostly by instinct. I knew I wanted a creamy parchment color, and I chose the rest of the scheme based on what looked good to me. The forests were a texture that I picked up somewhere. Here's the WIP thread: http://forum.cartographersguild.com/...read.php?t=847 ; I credited the source there.
You may also be interested in the Online Color Scheme generator thread: http://forum.cartographersguild.com/...read.php?t=567
I particularly like that Imperial Vendria map. How did you go about the color scheme? I like what you did with the forests too.