The Album art usually helps, but I'm really good at finding colors in songs. I'd agree with Dev's colors for most of his albums. I'm not sure what he says Synchestra is, but I'd say

Let it Roll-Brown
Hypergeek-Green
Triumph-Green and Gold
Babysong-blue
Vapolka/Vampira-Blue/purple
Mental tan-Light blue
Giah-blue
Pixilate-Dark Green
Judgment-purple
Simple Lullaby- Light blue
Sunset- Yellow
notes From Africa-light brown
Sunshine and Happiness-Green

http://en.wikipedia.org/wiki/Synesthesia