
Sweetbeets makes me smile. Lisa of Sweetbeets not only rocks the letterpress (and so amazingly!) but also creates eco-friendly cards, using 100% post-consumer recycled paper that's also processed chlorine free and uses vegetable-based ink.
I think her "1 2 3 4 5" collection (1 and 3 shown above) would of course make beautiful birthday cards (blank inside so you can write your own greeting!) but would also look awesome framed + hung in a kid's room. And, if you are not throwing a party for 50, they would also make lovely birthday party invitations that would set the tone for a very very fun party.