ArtWall is a macOS application that runs on menu bar and pulls images from ArtStation Staff Picks (https://www.artstation.com/) which allows you to set images to wallpapers.

Disclaimer :
ArtStation is the showcase platform for games, film, media & entertainment artists. It enables artists to showcase their portfolios in a slick way, discover & stay inspired, and connect with new opportunities. Ballistiq Digital Inc owns the "ArtStation" and ArtStation Logo. Downloading images from this application is under fair use.