I’ve found one of the best ways to pick colors for my cards or scrapbook pages, is to refer to the colors listed on the Designer Series Paper (DSP). These colors will coordinate with each other or Stampin’ Up! wouldn’t have put them together for the DSP!!
If you want to match the Stampin’ Up! Colours perfectly, you can use the HEX values for the colours. These codes will help you create journaling for your scrapbook pages or sentiments for your cards and they will match the Stampin’ Up! colours you are using!