I make 'corn warmers' out of regular popcorn.
Small ones for sweatshirt pockets so hands can warm up at work after heating for 1 minute every so often...it really helps because I can't do anything with cold hands.
Long narrow ones for across the neck to soothe achy muscles.
Larger rectangular ones for backs (achy muscles) and laps (again trying to stay warm).
At home on the bed I 'invested' in an electric blanket. I only warm the bed with it and LOVE LOVE LOVE it!!!! Nothing better than getting in a WARM BED when your physically tired, tense and sore.