Try searching at somewhere like wallhaven.cc[1], which aggregates wallpapers with good tagging, colour, size and ratio-based searches. A lot of the wallpapers there come from other sources like Flickr, interfacelift, Reddit, 4chan (for better or for worse), or just direct uploads. I wouldn't say credit is preserved particularly well at all times, which is a shame, but it is just a reverse image search away usually... - Source: Hacker News / 4 months ago

If you use this service I Could potentially see you IP address and wallhaven.cc API key. I don't keep any of these logs and I think the consequences of this is fairly low. But if it is a concern do not use this service. Source: 7 months ago

This page has good wallpapers: Https://wallhaven.cc/. Source: about 1 year ago

Don't have the link anymore but almost certainly something I pulled off of https://wallhaven.cc/. Source: about 1 year ago

I usually do it this way: determine the size of the image you need, so sum horizontal and vertical resolution of both screens, then search an image at least that size (for example on wallhaven.cc). Source: about 1 year ago

Stockup - A new library filled with stock Images. Source: almost 2 years ago