Putting a spray in your CS:GO folder
- First off, you need to navigate to this location in your steam folder:
\steamapps\common\Counter-Strike GlobalOffensive\csgo\materials\vgui\
- Make a folder named "logos".
- You need to get a .vtf spray image to put into the logos folder. You can find one on FPS Banana or make your own.
- After you do that and once you’re in game, go to console (~) and enter this:
bind "t" "cl_playerspraydisable 0; impulse 201"
*Note: "t" is the key you use to bind the spray. Whatever you bind it to should be your new spray key in-game.
Also for this to work the server must have "cl_playerspraydisable 0" enabled.
Source: http://www.reddit.com/r/GlobalOffensive/comments/yr4d5/tutorial_using_a_spray_in_csgo/