Trying to choose a color that you love and that goes well with the furnishings that you have is one of the most difficult choices you have to make when having your home painted. This color selection tool from Sherwin Williams is a great way to help you choose the best color. You can find a photo online and "chip it" and this program will find a similar color in the Sherwin Williams color palet.
I had a client who loved the exterior color of a house and wanted similar colors on her house. She took a photo of the house she loved and sent me the picture. At the time I did not have this tool avalable so it was difficult to match the colors that she wanted. Now it will be easy!