Is it harmful to put dyes in your pool to make the color different?

You know those pools that are so clear? Well I don’t like them. So I wanted to know if it would be harmful to put some kind of pool dye into the water to make it look like this for example: http://www.armenianceramics.com/images/Client%20Installations/Pools%20&%20Fountains/Craigs%20Pool%20Tile%20wide%20view.jpg