Here is a simple block Study.

I love to paint blocks because they are simple and you can study the color without worry of judging it too harshly. It's something I do for me to help me be a better painter.

Usually I set up the blocks and then put one color down on the board. Then I might mix another color into that mass on the board. Always remember to keep your painting knife clean and mix on the board never on the pallet. It will help your study and keep good clean pure color notes.