I attend many zoom meetings, and I enjoy changing up my backgrounds to reflect my moods.  Generally, when I look for zoom backgrounds, I have a few ground rules:

• The image cannot have a strong central subject in the middle of the picture, since that would be blocked by my head.

• The image can either be non-distracting, or it can be interesting but not overwhelming.  

• The images I use generally do not have blue sky in the center, since that creates an artifact around my head as it moves.  Not sure why, and maybe it's just me.  But I tend to go with greens and browns in the center of backgrounds.