Set your computer background to the latest hot /r/wallpapers post periodically 2.0
You can use any subreddit. Dropbox will not "clobber" your files, it will download new one after every run of recipe with (number) added to the end. You need to manually clean up the folder. Set your Desktop wallpaper to the "directory" [Dropbox]/IFTTT/hotredditwallpapers/ Don't use the file itself for wallpaper or it wont change.