I had done some colour theory previously but this reinforced what I remembered. We spend a couple of hours looking at the colour wheel. Then we made our own using warm and cool primaries. I learnt that the paintings were so vibrant because of the way they placed complementary colours next to each other. Red and green, yellow and purple, blue and orange : they weren't afraid of contrast!
Finally we copied a piece to learn the colours it used. Here is my attempt at copying Gauguin.