Hi EB. I thought I'd offer some insight into this little print.
I've been calling it "The Witches" Art Print (from my Witch gig poster). It was printed alongside the Weird Owl poster, so even though they're not numbered, the edition sizes are similar to the Weird Owl editions. link-http://www.expressobeans.com/public/detail.php/105877
So to be consistent, the colors of the metallic papers(editions) are Blue, Purple, Silver & Orange.