Muumit (Moomins) by Finnish illustrator and writer Tove Jansson.
Snufkin and friends stamp
Moomins - the best!
Moomin watching the sundown
A Hermit in Tove Jansson's "Moomin" Books - Articles - Hermitary
Tove Jansson, Moomintroll in Winter
All the paintings by Tove Jansson that I could get my hands on.