Cooler Master made the controls for changing the colors of the mouse keyboard led pretty easy. For the keyboard you will have to press the right ALT key and the key next to the right CTRL key to change the colors, you will have 7 different colors to choose from. In order to change the brightness of the keyboard you will press the FN key and the Page Up and Down. Now to get the LEDs in breathing mode you just hold the FN Key and the key next to it. It will cycle the colors.
The same goes for the mouse, you can change the mouse colors as simple as pressing the back button and the down button behind the scroll wheel. Making it pretty easy to switch the colors.
Here is a video going over the different lighting modes of the keyboard.
I however took a liking to the blue color for the mouse and keyboard. Here are some pictures of the lighting on the keyboard and mouse.