Back in the day I used to play Point of Existence 2, a mod for Battlefield 2. I'm not sure what the community is like for it these days but it was a great game. It didn't mix up the formula from the original game much, apart from the scenery, but the map design was quite amazing. If you get a chance to play it, in a full game, do.
The one map I can clearly remember above all else was in a thick forest (which in itself is different enough from the original game). It had a crashed helicopter in the centre and huts, camps and entrenchments around the edge of the map. Great memories of all my squad trying to rush a hut to distract the enemy while I managed to sneak round the back without them noticing.