DMerchen - You can find a quick guide here on how to use canvas grains from the forum:

http://www2.ambientdesign.com/forums...ad.php?t=18574

ArtRage uses the texture only currently, so you won't get the colour, but you can choose your canvas colour after you import one of the canvas grains. The section 'Creating and saving paintings' in the ArtRage manual has a basic rundown on Canvas grains ( see the subsection 'Creating a new painting' ) which can be handy for getting started as it goes through loading a grain, setting roughness, scale and choosing a colour.

I hope that's of some help.