Home offices are where colour psychology actually earns its keep, mate. You're after focus without fatigue, and a backdrop that doesn't make you look like a corpse on video calls. That rules out the two extremes: brilliant white (clinical, glary, gives you eye strain by lunch) and very dark drama (atmospheric but draining for eight-hour days).
Green is the workhorse here. It's restful on the eye and quietly energising — the colour of growth, all that. Farrow & Ball Card Room Green is a cracking choice: deep enough to feel considered, soft enough not to close the room in. If your office is north-facing or short on light, go a shade calmer with Mizzle — a green-grey that holds up beautifully in cooler daylight.
If green's not your thing, a warm mid-grey keeps things calm and grown-up. Little Greene French Grey is endlessly reliable, and Farrow & Ball Pavilion Gray gives you a cooler, more architectural feel that suits a sharp, minimal setup. Both photograph well on calls — neutral enough not to cast a weird tint on your face.
For something with a bit more backbone, Farrow & Ball Treron (a smoky grey-green) brings focus and a touch of moody sophistication without going full cave.
Now the "but what about a feature wall behind my desk?" question. Do it — but put the dark colour *behind* you (the wall the webcam sees), not in front. A deep colour facing you all day is wearing; behind you it just frames you nicely on screen.
Practically: prioritise a low-sheen finish like estate emulsion or matt to kill screen glare. Reflections off eggshell walls will do your head in. And paint a decent-sized sample patch beside your monitor — judge it both in daylight and under your usual work lighting, because that's when you'll actually be using the room.