@Fido: Well as requested you were after a L4D spray
You basically said you wanted a dog (cartoon, not photo) and the words Fido77

I've quickly stuck 2 up:



and



They can be downloaded as VTF (for importing into the game) in the following places:

http://sneakymonkeys.com/vtf/fido1.vtf

http://sneakymonkeys.com/vtf/fido2.vtf

(Right click on the above and 'save target as' to your computer)

If you want anything changing or something completely different let me know

P.S. the backgrounds are transparent and there some shadows around the words that don't show up as jpeg images, you'll see them better in game

p.p.s To import them, save them to your comptuer, open L4D, click options > multiplayer options > import spray and then navigate to wherever you saved those files