How to use texture swapper in NWN2 Patch 1.07?
Obsidain published a tutorial on this titled: How to use texture swapper in NWN2 Patch 1.07. which explains how you can use different textures for individual tiles, so one for the floor, one for the ceiling. This means that you can literally give your tiles amazing new looks without having to create a whole new tileset; certainly a boon for builders and a chance to go wild with designing!