If you're great at writing or art, you might be able to earn some money creating graphics and/or prose for greeting cards. This page has a huge list of 47 companies that are regularly seeking submissions from freelance writers and artists for the greeting cards they sell.
Are you wondering what are the BEST work at home companies to apply with? This post may give you some guidance. I've done extensive research to see which companies, overall, have the best reviews from workers.