Tons of potentially useful textures are hidden in model folders, this is where I log some interesting ones.  Maybe they correlate with textures we're missing?

props_borealis:
borealis_platform001 - Metal thing, uses that common pattern seen everywhere in the leak.


props_c17:
cable_01 - Ugly stretched metal texture.  I have not seen any metal similar to this though.
church_roof - includes part of the 512p version of lost rooftop texture.  Could be spliced into something useful.
column02a - Split vertically, has part of a useful texture on the right.
dormer_comp - Contains part of that old rooftop texture, good for splicing?
Metalladder002 - Rusted-to-hll metal texture.  Could be useful.
metalroof001a - includes alot of the lost rooftop texture, splice asap.
roof_comp - Small thumbnails of what could have been.  Useful for colors.
stonecolumn001a - Vertical stone lines, might be good for something fancy?
stonecolumn001b - Variant of above, except lines are not continuous.
stonecolumn002a - White marble/stone.
Tram_closeup - Big texture, 1024.  Could splice a bunch of stuff out.
Tram_closeup2 - Same as above, different color pallet.


props_wasteland:
metal_tram001a - STAY RUSTY!
rock_wasteland01a - Grey rock/concrete.


shadertest:
shader2 - Rocks, has a normal map too!
VertexLitSelfIlluminatedTexture - Cool building texture
VertexLitTranslucentTexture - Weird-ass bricks lain by a madman. "modern art"


window:
glasswindow - It's a window.  :/