The National Trust has made available pictures of some of its interiors specifically for use as Zoom virtual backgrounds. I've plumped for Agatha Christie's library at Greenway (see also) and Vita Sackville-West's tower writing room at Sissinghurst.
Nothing to do with Zoom now, but if you're in the mood for some soothing background sounds, I've just discovered Mynoise and am enjoying the healing waters of Sunik, a wild day on the Irish coast, and a Japanese garden for starters. What I particularly like about this site is that you can adjust the elements of each soundscape to suit your own taste - for instance, fellow pluviophiles might want to up the rain!