So you obviously are addicted to those little furballs...
The books are wonderful, and you really can read them year after year. And talking about an artist Tove Jansson: even though most people know her about the Moomins, she was also a great painter.
About the copywrights:
(as far as I remember...)
The rights of all the cartoons and those japanese cheerful-moomins are in Bulls characters, or something..It's a big cartoon company, so I think they don't let pics to be used very easily...
The rest of the pictures, characters, and maybe the stories are owned by the Moomin characters ltd. they may sell you a using lisence (it goes like that with "the usual artists", but moomins can be quite unusual) Or they can be at the original bookpublisher, Schildts...
So anyway, you cant use without a permission (of course...) But I don´t know how easy it´s to get.
Another thing is why you want to use it, at all?
Those Right-things are awful, they have so many unveiled paths...
By the way, does anyone know about the right´s in Internet? Can you just scan anything and put it to your pages? Or do you have to have a permission?