Paul Klee (1879-1940) created art which combined a myriad of different mediums and materials. From watercolours such as LMS describes, to ink work, pastel, oil paint and etchings, the Swiss/German artist made the most of what was available.
He also used canvas, cardboard, gauze, wallpaper and various other materials to place his art upon.
The eclectic combinations made Klee's style one most definitely unique to him and he drew on cubism, expressionism and surrealism to influence his work.
Klee's experimentation within art led him to conquer colour theory, which he subsequently wrote widely about (the Paul Klee Notebooks).