There's always warp waste in weaving. The only way to use nearly 100% is to use a dummy warp for tieing on to the warping beam. In September, I wove a shawl using a painted warp and solid-color rayon for weft. It came out beautiful largely in part to the painted warp. So when I had to cut off the ends of the beautiful painted warp, I simply had to save them.
Today after seeing an innovative idea of rug weaving, I tied them together end to end, wound it on a bobbin, and started weaving.
I've used three components in this fabric: the thrums, medium brown rayon yarn, and half-inch strips of fabric. Each component gets a few shuttle passes and then I move to the next one.
What will I do with the fabric? I don't know. It hasn't told me yet.