Paint colors to the rescue

In my experience as an environmental graphic designer I've run into the following problem quite often: a customer specifies a paint color and I don't have the corresponding fan to even imagine what the color looks like. How can I suggest colors for the signage if I'm not sure what the walls look like? Thanks to the folks at colorcharts.org that's not a problem any more.

I have a feeling that the site is primarily designed for people who want to digitally "try" different paint colors for their homes and have to purchase and download the software, but I use it to type the paint color I need, then sample the resulting color and use in my program.

Check out this great collection: http://www.colorcharts.org/