As shown and described in the video, add images to the color chart (provided in the downloads section on this page) of the full range of colors and saturation - then do color palette studies as shown in the demonstration for at least 20 of the image references. These will be yours forever. It's a very useful assignment for exposing yourself to new color palettes!

If you cannot open the PSD file, simply make your own chart (it doesn't have to be fancy, it just needs a color spectrum/rainbow and saturation).