I wanted to show screenshots of this prefab for the NWN2 guys to see how can NWN1 look like. Unfortunately I can’t find it.
It was one area prefab using unique tileset made specifically for this area. It was crypt or maybe chapel or temple, iirc 2x2 or 2x1 interior area. Might have been inspired by Icewind Dale 2 I think.
I didn’t play IWD1 (yet), but author mentions it. There are two projects, one with images with 1 file to download, the other without but with 2 files and there the IWD is mentioned.