I just went with the same color scheme as the rest of my Tau of course, doing it similar to my Crisis suits. I did do the edge highlighting, which is something my first round (which is a vast majority of the army) did not get. Someday if I care I'll go back and touch-up/highlight/varnish my army. Today is not that day.
This is such an awesome model. It does take quite a bit of work to paint though, being so large. I don't know what I'm gong to do when I run out of Fenris Grey though..
On to the next project! I plan on finally painting up my Longstrike next. Then it will be time to come up with something for Mek Guns.