They actually did produce these, apparently. OWI were kind enough to send me a single sheet of stickers as a birthday gift for being a member of the fan club... Was really nice of them.
Funnily enough, I came across them the other week while sifting through old documents. Shame I lost the birthday card they sent.
E: I wonder how much stuff they managed to sell. I can't imagine the demand for it being that high.