You can find here 1650+ doom3 textures converted to oldgen engine texturing (no normal, height or spec maps).
(they are available as individual PNG and zipped paks)

> > D3RetroTex on GoogleDrive

You can use these freely, have fun, no credits needed, excepted maybe for the awesome id's artists =)
-Adrian Carmack
-Kevin Cloud
-Andy Chang
-Pat Duffy
-Seneca Menard
-Kenneth Scott
-Patrick Thomas
-Ted Anderson
-Pat Jones

Todo :
-256 colors
-brightmaps, animations, wad (any help, advise, tips are welcome here, I still don't have a lot of experience in this domain yet)