Niki de Saint Phalle's pop art from the late '60s are everywhere lately - on display and at auction. Her cartoon-like snakes and plump, joyful women became one of the era's most resonant feminist messages: a battle cry for women's liberation. Her cartoon snakes and joyful, leaping women were translated into all media, including jewelry by Gem Montebello. An enticing collection is on display in London now.