Even though I am not an artist myself, I did work in an art supply store years ago managing the custom printing department (wedding invitations and the like). Working there I developed such a fondness for kraft paper, so I love seeing your sketches on it! I actually using a thicker card stock version of it when I made my very first business cards. I think I still have some of them hanging around. :) I always enjoy popping by to see what you are working on.
RE: 6 things for Extreme sketching