Ok I vote for the new green and a more subtle blue. That's just me of course being whacky but think you should sorta mirror whatyou have going already and there are a whole lot of colors there. The one lighter round you have is probably more than enough and if you need more do a simple small round say 2.5 inches or smaller so it stays in the view but not totally standing out. You want the center to stand out and the outter rounds perhaps to just make the center shine more.