Here's one: Myth Understood, a design by DRO72 for sale on Threadless.
We've bought T-shirts and pillows because the sentiment expressed by it is so pertinent to the many people in our lives who suffer from depression or a lack of belief in themselves.
Of course it will appeal to the Nessie fans among us. As for me, I'm going to wear it proudly at the next Supernatural convention. It fits right into the Always Keep Fighting campaign.
Buy it here: Threadless Myth Understood Items