National Gallery of Art
National Gallery of Art: Gemini Artist Workshop 1966 1996
An invaluable site showing works and discussing artists who were part of the Gemini Artist Workshop. Artist include David Hockney, Andy Warhol, Nancy Kienholz and over 50 others.
Other
Kingwood Library: American Cultural History: 1990 1999: Art and Architecture
Offers a brief summary of some of the trends in art and architecture during the 1990s. Many links throughout the text will take you to other sites with relevant information.