Add the Wikipedia picture of the day as your Mac display background! First, make sure you have Dropbox installed on your mac. Then, add this Recipe and wait for it to Trigger. After that, the folders will have been set up and the first image been saved. You can then set it as the target wallpaper folder in your Mac Desktop settings. Choose how often you want it to change and voilà!
Explore more great ways to automate Dropbox and Wikipedia