You might not even need something like feh if you just have wget place the images in a folder the computers wallpaper slideshow function points to.

Also see below for some points on getting started.

https://stackoverflow.com/questions/10639914/is-there-a-way-to-get-bings-photo-of-the-day

https://gist.githubusercontent.com/insanepoet/cf4074d7aa1a455ff5b0437497f8dd14/raw/bde27f46046533f7ee9be750330a94c334f95535/bingphoto.sh

I would love to see lemmy.ml(and other instances) grow. One of the things I actually I personally would really love is having a site layout option that closely mimicks old,reddits.com layout. I suspect this may also help the site grow given the that many long time reddit users really dislike the new design it may give them a solid push to check out lemmy.