There's a single copy of a book that was published in 1515 in Antwerp (the city where Moenen & Mariken went to) that told the legend. It was re-pubished in the early 20th century. And it contained woodblock prints. And those prints can be found online...
An impression of the stamp that I carved (in dark brown fluid chalk ink). The original can be seen here.
I'm pretty pleased with it -- except for the eyes. I messed that up.
The stamp, after being inked a few times. It's almost 10x10 cm. I used the orange 'Grade A' PZ Kut from the sampler pack. Initially I tried to use the MasterCarve block from the same sampler pack, but that was just too soft -- cost me an evening of work. :(
Close-up of part of the stamp. In this picture you can see the height difference quite well.
I might do the other prints as well -- do a series of stamps, so to speak.
Incidentally, the local games shop is called Moenen & Mariken -- I recommend them for all your gaming needs. :)