mmolai freebie: Vector stucco filter.
Detailed image below:
and an example of the filter over a finished design :
Use your pathfinder tools to get it all nice and useable, if need be.
Also check my vector grunge filter pack on Vecteezy.
[edit: I have it hosted up on Deviant, you can also download it from there or view another image. The file is a vector pdf... drag it into Illustrator]