I would recommend at least 5 different colors for the best effect, but the beauty is-you get to choose! You can use the base of this pattern to make about any sized blanket and I have a chart that includes 7 sizes. This one is about as simple and as customizable as it gets! The Block Blanket is a choose your own adventure pattern. Crochet Blanket Patterns for Beginners Block Beginner Crochet Blanket