I've debated getting one to put on the ground for my feet.
amazonAmazon.com : Multi-Purpose Heat pad,Warm Desk Pad,3 Speeds Touch Control Waterproof Heated Big Mouse Pad,Desk Protector,Auto Shut Off ,31.5" x 13" Extended Edition Gaming Mouse Mat,Pet Pad,Foot Warmer Pad(Black) : Office Products
https://www.amazon.com/dp/B0989Q142M/ref=nosim?tag=cougarboard07-20[https://www.amazon.com/gp/product/B0989Q142M/ref=ppx_yo_dt_b_asin_image_o02_s01?ie=UTF8&psc=1]
I work in an unfinished basement when I work from home so it's pretty unbearable in the winter. Space heaters make it super dry and don't really keep my hands warm (even with a mini space heater on my desk pointed right at my hands).