I like the idea of a school of chromis...
You could always do blue reef instead of green.
When I set up my next tank I'm going to do a school of chromis, probably a pair of b/w percs, some kind of shrimp goby w/pistol, some clown gobies, a flame or coral beauty angel and a mandarin once established... Havent completed the list but thought it might get your gears turning...