Block print created by arranging LEGO tiles on a Lego baseplate, then inking and printing them just like you would any block print! My printed signature was done by hand-engraving a LEGO tile.
 
3 x 4 inch image on 5 x 7 inch masa paper. My LEGO prints are not limited-edition, given that the printed images themselves are basically instructions on how to make your own, but each one is hand-signed and dated in pencil.