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.
Work at Home with Greeting Card Companies ~ KT, this would be the perfect summer job for you! You are so witty and such a wonderful writer, poet, rapper, etc that the card industry would LOVE you! It would be a great way to earn some extra money, when you have the time! I love you!
How to Sell Greeting Card Designs: 1.Research the market. 2.Evaluate popular niches. 3.Choose whether you're going to create handmade cards, design and print your own cards or hire a printing company to print your designs. 4.Purchase an inkjet printer if you plan to print your own cards. 5.Design several greeting card prototypes, contact locally owned stores in your area. 6.Sell your greeting cards online.
If greeting card merchandising doesn't appeal to you, how about writing them? This sounds like very fun, interesting work to me because as we all know, greeting cards are very short and to the point. Usually you don't need to write more than three or four lines max. Almost all greeting card companies (with the exception of Hallmark who doesn't openly accept submissions) will consider work from freelancers.