The Return of Schabbs (abbreviated T.R.O.S.) was a Wolfenstein 3D project, made by Ryan Steinbruner. Announced in April 2002, screenshots were posted half a year later, with no other news surfacing on the project.
A screenshot was released on March 4, 2002 which featured a textured floor and ceiling; whether this had been doctored is not known, as no mods at the time had such features.
The screenshots that were released from actual in-game shots on October 1, 2002 did not feature textured floors and ceilings. A great many number of graphics originated in DOOM, however.