I created one called Asunder a million years ago. I just checked and I'm surprised that the person maintaining it has kept updating all these years. Source: about 3 years ago

You can try https://wallpaperscraft.com. Source: over 2 years ago

You could search around for desktop wallpapers of those and use the image(s), but I'm not too sure how you would link them lol. But from my experience, desktop wallpapers are the most convenient way to search and find free-to-use high-res images for personal use. I get mine here, and I typically get my custom mousepads here, they're very high quality as well. Source: almost 3 years ago

Sure... Let me see if I can find it again. https://wallpaperscraft.com/ is the main site. Let me go combo through and find the exact link. Source: almost 3 years ago

You could browse some cool images of desktop wallpapers and find one that you like. You can also check these custom pads as an alternative, they're great as well. Source: almost 3 years ago

I would recommend looking for desktop backgrounds/wallpapers that fit your description. Easiest way to get free, high-resolution stunning photos for personal use. I found an image on Wallpaperscraft and had it printed on a deskmat with Yourplaymat, turned out great! Source: about 3 years ago