I used a special technique for this poster, as we were only allowed 3 colors (with black counting as a color). My 3: orange, blue, and black. In order to get more colors, I decided to use a dot matrix overlay technique (I doubt I am the first to do this but I did come up with it independently). Basically I used squares composed of different densities of dots to get multiple values out of each color. When I overlay and print the different colors on top of each other,new colors (like the brown in the bear which is the blue and orange) are created. I tiled the squares over my image and got rid of the excess dots until I had achieved the desired shape. Pretty cool stuff.
This process also gives a modern shout-out to old letterpress printing styles and screen printing. I like old school.
Check out my bear: