In PhotoShop Elements I picked six colors from the plum using both the inside and outside and created the palette you see in the first image. I printed that out and headed to my studio to see how well I could match some colors and I felt I came pretty close. But I felt I had to go one step further and actually put them together in a design to check the cohesiveness.
The third image shows the completed design but unfortunately the colors in the photo don't really match the actual card and I was unable to correct that so you'll have to take my word that the cream color actually has more of a yellow cast and the plum color actually has more red. As long as I was showing you the design, I thought I'd also show you what I put inside since it coordinates so well. I often just put text on the inside so you are getting a real treat.
So I consider this to have been a good way to select a color palette as well as a good excuse to try the new doily image. I just wish I had been better able to capture the actual colors in the cardstock.