I don't have time to read all the comments so if I repeat some one, I'm sorry. IF you have washed all (especially the flannel) prior to cutting, why not make a rag quilt with the flannels on the back. When doing so, use at least 1/2 inch seams and use the satin on the back with the flannel for additional texture but fuse 2 satins wrong side together omitting the fusing in the outer 3/8 of the seam allowance. Even that bright yellow should work if you mix it in on the BACK with the satin and flannel.