3C is the most pleasing to my eye.
Good Eye! I'll have to set it up like that when I get my substrate in this weekend!I think it would look really nice with a combination of the reddish colored rocks on the right (maybe minus the big smooth polished ones), paired with some combination of the darker woods you have. For instance, 4A would be nice as it follows all the aquascaping rules as far as I can tell. Then just strategically place the redder rocks as accents, maybe use some to define a rise or drop in elevation from another part of the tank (perhaps the back?). Lots of red accent plants would REALLY stand out in there and would look awesome, IMO Should be nice, and keep us posted.