I would initially say that I liked the idea of Green/Black diced, possibly with Yellow flashes. That would tie in the colors but not looks so identical as to get into too much tartan.

I say this even as I have a pair of yellow flashes on order to wear with my new XMTS kilt, but in looking at the thread on those kilts, the yellow is allot brighter and more prominent than I thought it would be as a choice for flashes. So I am not sure my advice is all that great.

Allot of this is going to biol down to personal preference, some of my tastes are clearly not in the majority on this forum, but when assembled I think they work well. I may actually have to take pictures to prove it some day.