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.
Would you like to work at home as a freelance writer? Here are some of the various types of writing gigs (blog posts, recipes, short stories, greeting cards, etc.) where to find them, and how much they pay. via The Work at Home Woman