I use the poplin method but use some old cotton like a sheet but sew around it with wash away thread in your bobbin. Slit the middle of the poplin and turn the block right side out. When you have it right side out and how you want it. Use a steam iron and press it well. The was away thread will disappear, your edges are turned under and you can pull the poplin off. I use this method with numerous appliques. Works wonderful.