Are you making a map but you don't know what textures you're using yet? Do you just want to flesh out your map without having to put up with !'s and startans everywhere? Inspired by UnreadED's blocks, I made textures meant for brainstorming purposes.
Preview
http://imgur.com/6vWPeh6
http://imgur.com/AwtUN3f
File
Filesmelt or Dropbox
What you get
10 Colors - Black, White, Blue, Cyan, Green, Orange, Purple, Red, Tan, and Yellow
Various sizes per color - 8, 16, 32, 64, 128, 256, and 512
A "Fuzz" and Solid texture per color for brainstorming sectors in odd shapes.
Door/Panel shapes per color in various sizes including
Spoiler:
DB will automatically sort the textures by color since I used pk3 folders.
Enjoy!