For writing paper in different colors, such as yellow, pink, blue, green, and purple, there are a few options available. Most office supply stores will carry colored paper in a variety of sizes and colors. Additionally, online retailers such as Amazon and Staples often have a wide selection of colored paper. For a more unique look, some craft stores may also carry specialty colored paper. For a more economical option, some stores may have a selection of colored copy paper, which is often cheaper than colored writing paper.