I have been reading up on a few blogs and found this video of a Gettysburg game in 6mm. What I think struck me immediately was the way the wooded areas have been created, maybe I'm out of touch, but I have not seen this method before! It's really very clever and realistic for this scale.
The rules used here are 'Altar of Freedom' ACW, a set that I have been sitting on as a purchased PDF for some time but I have yet to be able to print!! The whole game is very clean and tidy, something that appeals to me.