Today I did a first - I made a donation to a website that I have used many times. If you don't have Stampin' Up!'s Color Coach this website is the next best thing.
The website is easy to navigate. Find a Stampin' Up! color or colors you would like to coordinate with \Stampin' Up! colors. There is a drop down menu on the left-hand side, I normally select "All Colors." Find your color(s), double click on each one and they will appear in the middle of the page. Select "Search" and the program will find coordinating colors.