http://www.cstrike-planet.com/files?dl=29 (link to HalfLife logo creator)
There is another program out there called Wally But i dont recoment it.
1. Start up the program
2. Click open and choose your picture
3. Change the size of it until the little red bar turns green Or hit autoSize
4. Click the little buton at the bottem that says save( save it to your desktop)
5. Then click Make Wad
6. Rename the pldecale.wad file to tempdecal.wad
7. go into C:\Program Files\Valve\Steam\SteamApps\*your name*\condition zero\czero
8. Put the tempdecal.wad file in there and then it will ask u if you want to replace the old one. You DO!!
9. After all that, rightclick on the file u just put in there, go to properties, And CLICK REAd ONLY hit apply and your done
Congradufuckinglations!!!!