A few months ago, I downloaded a mod that had just been released that was for making interior cells act like exterior. It had billboard trees, and blocks of landscape that could reworked to form new area. It was divided into 3 sections... green forest, snowy forest, and something like ashland dead forest.

My harddrive had to be replaced, and I lost the download, and now I can't find the mod. Does anyone know what mod this is?

Perchance it was http://www.gamesas.com/index.php?/topic/1039433-shannons-forest-tilesets/?

Yes! That's it, thanks a bunch!