This looks like fun work! Recycled Paper Greetings are all designed by freelance artists, and 3,000 new cards are added to their line each year. The company believes that the strongest messages and artwork come from "individuals expressing their feelings in their own styles." The review process can take up to two months, but you can send your ideas in batches of ten, and simultaneous submissions are acceptable.
Unfortunately, I have no artistic talent. So this opp is out for me. But if you're the artistic sort, and you have lots of ideas, this might turn out to be a great extra income for you - possibly more. Here are RPG's artist guidelines and submission information. Good luck!