I build a wallpaper app with only wallpapers from #background-per-day in Slack. It has a desktop app and a web app. The web app can only download the wallpapers, while the desktop app can set it as the current background. It also has a "wallpaper rotation" which changes the wallpaper in a specific interval.
Once you ship this you can't edit the description of the project, but you'll be able to add more devlogs and re-ship it as you add new features!