You just download some spray from "www.fpsbanana.com", etc. After you downloaded and extracted it then rename it to "pldecal.wad" in short for player-decal which is the actual spray.
I did, and it worked perfectly. And yes.. for Counter-Strike: Condition Zero.
But I probably have the old version of it. Since there is updated versions of it. -.-
I still think the old one is the best.
Nothing beats originality. ;)