Here is a trick, cut off the knots, then take the ends of each piece, fold it over so you have about an inch folded back and cut a small slit into the center of the cut so basically it looks like a button hole in the end of the strip. Then slide one cut end through the hole and pull the long end through to catch the fabric and pull. it's a quick way to attach the strips without the bulk of the knot. Now, you are ready to crochet or you can braid and zig zag the braids together to create a rug. Or, you can make a simple rug frame by nailing some wood together into a frame the size of the quilt. Wrap the warp with heaving cord or Peaches and Cream cotton yarn and braid down the cords to make a quick rug. There are so many possibilities! Search Youtube for videos! I wish I had your stash of teeshirt scraps! How fun!