Found the source (think it's the blog you are talking about) via reverse image searching (
http://www.tineye.com/ <- Try it, its great for these kind of things!) and in this post:
http://skydragon.hu/?p=786 he (from what I understand from the translated version) states that he vectorised them to put on a t-shirt. I will get in touch with him to see if it's actually his own and if it is I could ask him if he would allow me to post them on the Vector Gallery.
