Cream the Rabbitch TNT red
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Save the .tga anywhere.
Open CSS, import spray
navigate to the .tga's destination and...
click on the thing. VOILA you have a spray >:3
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Gave the .tga for 2 reasons
1) You can modify it (don't see why, maybe 
just the pixel dimensions for size

2) Putting the .vtf in the VGUI>Logos folder
doesn't work.