These are some great inexpensive handwarmers you can make with scraps of fabric, some rice, flaxseed, buck wheat or for the longest lasting heat-ceramic pie weights!
I suggest using a nice flannel cotton fabric, whatever you do test the fabric by microwaving it for 1-2 minutes to make sure it doesn't melt or anything.
I embroidered this one for when we go to OSU games and then blanket stitched around the edges. Fill with item of your choice, if you fill with rice or flaxseed you may want to sew the edges with a sewing machine with a small stitch distance so nothing falls out. Add a few teaspoons of dried lavender if you want.
Place the handwarmers in the microwave for a minute or two and enjoy. Rice/flaxseed will last about 30 minutes, pie weights last longer. If you give them as a gift make sure to include instructions so they don't microwave them for 10 minutes or something and destroy their microwave.
Any other ideas for what to put in these handwarmers to keep your hands toasty in the cold winter months?