A simple corridor map for GMod (Source engine). Visual style like the "endless" corridor from the Matrix Trilogy, or a generic hotel hallway. Doors along each side of the hallway, but these doors don't open or go anywhere.
The hallway needs to be roughly 200 metres long, with the textures used on the floor changing every 20 metres.
Ie First red carpet, then white tiles, then grey rock, etc, etc.
It doesn't matter what the textures are, as long as they are "real world" and they are all different.
Variation in lighting will also be needed (ie first half is well lit, while the second half is only low lighting)