For those working from couch: A warm comforter and beanie to keep warm and utility bills low and a nice large cutting board to keep the laptop away from the comforter.

For those working from desk:

Warm fleece, slippers, beanie to stay warm and keep the utility bills low.

Curved monitor

A posture straightening contraption (like a bra, but I don't know what it is called).

1 year membership to a cool nearby yoga studio / gym.