It is a set that I have not seen anywhere else, I'm afraid. You could certainly write and ask Veronika (use the "contact us" link at the bottom of the page) if there will be more of that alphabet set done in the future. Just knowing that there is interest can make a difference in whether or not it is ever done. I myself am waiting for additional letters in the cute little cow alphabet.
I havn't seen any in my travels either. Like Jrob says they were there when i first enter site long before I got up nerve to chat.
Hang in there Connie, there is sure to be someone who knows this answer, sorry I can't help, but here's some love, hugs and a flower to welcome you to our beautiful site.
They have been here on the site for a very long time. They were here the first time I logged on, and I don't know where they come from. Perhaps, someone else has run across them somewhere. Good luck. ;)