I found here. Those get ironed on to scraps as I find them and rough cut until evening TV time. It's pretty easy to trim them out with a quarter inch seam allowance. I turn the edges under using the technique that I found here. Next time I'm at the ironing board, it doesn't take long to glue baste them to 5 inch squares all ready to go into the busy bag. I'll start on the blue block for January and then pull out whatever stack matches the rainbow scrap challenge color of the month. We have a car trip coming up, so these blocks in a bag should come in very handy.