Here you go, just pop the files that are in the zip into your *\counter-strike source\cstrike\materials\VGUI\logos folder, then simply go into the game and select the spray. :cheers:
I decided to write up a tutorial for making a transparent spray. It may lack images at this time, but I gave plenty of detail. - transparent spray tutorial
That is exactly how I do it, I hope it helps you and others out :thumbs: