I made about 24 at Christmas time, and 6 just last week. I just quilt an "X" from corner to corner (as if I was doing a rag quilt) instead of stippling. And I don't draw any lines, just fold and measure. Be sure to measure from the edge of the fabric, not the edge of the batting. I mark 3/4" from the fold, and 2-1/4" from the edge. You don't need to backstitch from the edge, but do backstitch at the point at the fold.
Be sure to use 100% cotton batting. And I have read where some have caught fire, but that's because they were left in the microwave too long. I don't put one in the microwave for over 4 minutes, and it usually only takes 2-3 minutes to warm something up. And they are good for protecting your hands from cold foods (like ice cream), too.
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