Just thought I'd comment here that I only needed to take one look the awesomeness of this design (via Twitter to The Yetee) before snagging that shirt. And now I want to see all the other designs too, even if I can't get them in a shirt collection!
(Also the link on The Yetee to your DeviantArt was broken. They put a period in the URL instead of a colon. I came here manually, but maybe if you have a contact at the site you can let them know?)