The above is an amalgam someone made of all the colors of light, plus White in the middle for life, and black around the edge for Death. Kinda neat.
Each section contains material specific to that Corps, I have the history (as much as I can gather) in the "War of Light" "Blackest Night" article as well, to mesh up pics with each individual Corps. The last is a fan inspired section, which is very small right now, but will grow as I gain new pictures and update.