A few months back, I gave a talk about yokai to a group of students visiting Tokyo from the Oslo National Academy of the Arts. There are a lot of Norwegian folktales that resemble those from Japan - trolls and such - so they were a very receptive bunch.
A few weeks ago, one of the students, Stian Tranung, mailed me photos of this beautiful yokai stamp set he made by hand after reading Yokai Attack. Very cool and I hope he considers mass producing them!
Some examples. Top left to right, Tengu, Kappa, Funa-Yurei. Bottom: Hitotsume Kozo, Nue, Tanuki.