Similar to Praxismo's
But this is my version, and I prefer to call it "textures".
Download the new: assets.map (lights, stairs, slipgates, octagon trim blocks, etc.) Also has clip, water, and lava textures.
These texture blocks are in alphabetic order, from top to bottom; similar to viewing the listing of materials in the ContentBrowserHack.
Column 1 = Main (grid) textures.
Column 2 = Main (no-grid) version.
Column 3 = Trim version.
Column 4 = Lights.
How to use:
1. Put textures.map in your reflex/base/internal/maps/ folder.
2. Run Reflex, go to console, and type: map textures
3. In console, type: savemap mymap
4. Them type: map mymap
5. Begin editing/making your map.
Select a textured block, and press "K" to get (set to active material) the texture from it.
Now select your block, and press "M" to apply that texture.