This script automates creating simple textures, using solid noise/emboss. Easily create paper-like textures or more coarse gravel-like ones.
The texture appears on it's own layer. You can adjust opacity, layer mode, and various other settings beforehand, and you can also see a preview of how it will look.
The plugin is coded for 2.6. I haven't tried it on 2.7.
Comments & feedback are welcome.
When you download the script, rename it so that you change the extension from ".py.txt" to ".py", otherwise it will not work.