Download of ArtWall 1.0.2 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is a product of Haotian Zheng. ArtWall for Mac relates to Theming Tools.
From the developer:
ArtWall is a macOS application that runs on menu bar and pulls images from ArtStation Staff Picks which allows you to set images to wallpapers.
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.
You may want to check out more software for Mac, such as Webshots Daily Features, Desky or Desky engl, which might be related to ArtWall.