I’m not sure when they introduced this feature, but I just found out about it today. Check out some of these great Onion Magazine covers:

Books: http://www.theonion.com/content/node/45995
Beauty: http://www.theonion.com/content/node/44863
Heroes: http://www.theonion.com/content/node/42560
First Lady: http://www.theonion.com/content/node/42136