How to Add Color on a Circular Needle

Adding color on a circular needle is done exactly the same way as on a straight needle, no matter if it is at the beginning of a row, in the middle of a row (http://www.youtube.com/watch?v=Qbo4sov1gU4), or even fair isle (http://www.youtube.com/watch?v=qZ9OWatSqKA),..  Don't be afraid to add color. It adds another element to your project. Here's a picture of a colorful hat I knit by using only two colors.