I make rag jean quilts "free style". If I am lucky I have "yard sale" jeans in many colors whites, blues, browns,blacks, even greens and reds. I cut my squares with a common height, maybe, 7x6, 6x6, 4x6, 5x6 and so on. I discard the thick seams. I do include plenty of pockets with a single thickness border for seam alowance. Using a 1" seam alowance piece the rows then staggar the vertical seams. I usually back each square with a double layer of flannel some times well washed yard sale PJs, which adds to rag effect and finished the back of the quilt. Once you get going it will just flow... Hope this helps