I am now showing the fruits of my "Retexturing walls" threads labour. The corrupt wallset! If people here like it I will probably offer the files. It is my first edit of anything however (excluding the retexturing tutorial).It's perfect for horrer needs, I'm especially proud of the ceiling. It kinda has a 'silent hill' look.

I added rust to the metal parts.
Enjoy.
Edit: Pictures are GO!
Added stairs (see first post second page).
Added objects. Pillars etc. are now objects. And it now includes:walltext,trapdoors and pit, alcove, and alter.
Download here:
http://grimrock.nexusmods.com/mods/71/ (thanks for reminding me neikum)