Found this great link to colors you can select from Pittsburgh Paints that will match Fallingwater’s color palette: http://www.voiceofcolor.com/collections/fallingwater
It will also let you order the brochure or use the colors in their paint color visualizer tool. Very cool!
The background color is now Frank Lloyd Wright’s classic Cherokee Red (#79413A, R121/G65/B58, H4/S84/L84 on the addative color system for your info).
Just a reminder as well, please be sure to hit the G+1 buttons on as many pages as you possibly can so I can continue to provide you much more Usonian content. Thanks so much for the help so far! It should also help you to find more Usonian and Frank Lloyd Wright Information into the future.