My old blanket is still good, but the bindings weren't. I found among my mother's sewing things a packet of light blue blanket binding, but that was only enough for one end.
So I used matching quilting cotton and made my own, folding under and pressing a quarter-inch edge on both long sides and sewing it onto the blanket with a zigzag instead of straight stitch. Now I have a choice when I change the sheets - do I want the blue end showing, or the green?
Now you have to say "light blue blanket binding" five times as fast as you can. :D