Weedy Seadragon, Phyllopteryx taeniolatus
Yes, this a real creature, Nick didn't make it up! Believe it or not these astonishingly ornate and unique creatures are only found off the southern coast of Australia. They are related to Seahorses.
Notecard measures 4 1/2" x 5 1/2," includes an envelope, and comes in a clear plastic sleeve.