I'm really fascinated by the versatility of the backstrap loom. I'm also fascinated with creating designs in cloth. One of the ways to do with is with weft substitution. I'm thinking that the term means the same thing as brocading but would be glad to have someone put a finer definition to these techniques.
Here is a video I found on youtube...http://www.youtube.com/watch?v=E2EER_GrZzo
Here is a backstrap weaving that a friend in the fiberguild loaned me. The warp is cotton and the there is the ground weft of the same size cotton as the warp and then the secondary weft with is bright colors that are much thicker---at least twice the size...of the warp and ground weft.
I have one book on the subject which is...
"Latin American Brocades: Explorations in Supplementary Weft Techniques" by Suzanne Baizerman and Karen Searle with special weaving instructions for rigid heddle frame loom, backstrap, and floor loom.