Also, this texture was to test if I can successfully zip up a texture
It turns out that...
1a and 1b are for solid walls, 1a is just the left side.
2a is for the walls underwater, and the left side of a "deep wall."
2b is for the front and right sides of a "deep wall."
3a and 3b are for fake walls, 3a is just the left side.
If anyone was confused about this beforehand (I definately was
), this might help 
You can use the texture for a level if you want, it isn't very detailed but it could be interesting
Or you can just look at this test level for an example of what "wallside" corresponds with which walls.
