Haven't stopped over here for a long time but I found this and wanted to share it.

[IrishAyes]

7. Here's one

One of my favorite uses for old pillowcases is to make bedwarmers for winter since electric blankets, even top brands, have been known to catch fire.

Fill the pillowcase (twin size) only about half full of rice. Then fold the open edge over a couple times (each fold narrow) and stitch by hand with long running stitches. You want the bag to be very flexible when 'filled'.

Place the bag in a microwave oven on low, with a turntable or stop and give it quarter turns yourself every minute or so. Occasionally remove the bag and turn it upside down, back and forth, to redistribute the contents so you gauge the true heat. After enough practice you'll know the routine to use with your own equipment w/o constantly testing.