if you are on Gimp, you can try this ones:
- http://gimp-texturize.sourceforge.net
- http://fimg-gmplugins.sourceforge.net
I guess that there is a perline somewhere in Gimp too.
EDIT: in this place http://devmag.org.za/2009/04/25/perlin-noise/ you can find a way to create your own textures using perlin.
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