Karel Appel painting?
There's a painting on the wall of David Hemmings' studio in "Blow Up" that looks a lot like something Karel Appel would have made. Do a Google Image search for Karel Appel paintings-- you'll know the one I'm talking about. It has a light blue background and tall, yellow-ish figure in the center, with red wing-like things.
This is bugging me to no end--was this, indeed, an Appel? I hope someone knows.