I find these sites VERY useful these days for getting an idea for color schemes.
http://kuler.adobe.com/
http://www.colourlovers.com/colors/top
Hope they help!
Color shades have several different causes. The printer may use a different ink; in the early days, inks were made up in batches as needed, and were rarely consistent. In such cases, the shade provides information about when the stamp was made, and possibly even identify a particular printing.
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and for integrating that into blender, i wrote http://wiki.blender.org/index.php/Manual/Materials_in_practice#Color_Management_wiht_the_Color_Picker_Applet I think you will notice the kuler theme in the example.