AIGA Design Archives
The archives of the American Institute of Graphic arts have thousands of images, including entries from their annual juried design competition, which started in 1924. You can view a list of all the "Collections", or "Browse" the archives. Choosing "Browse? offeres a choice of filters such as "format", "industry", "location" and "color". The color filter allows visitors to choose from 120 colors, and the results are beautiful.