From RoK Wiki

What is a skin?

Skins are custom themes for the game client that allow players to modify the appearance of the interface with their own images and colors. The client comes with about 10 different skin choices and is set up to easily allow the creation and addition of new skins at any time.

How do I change my skin?

• When you are logged onto RoK, click on the "Settings" tab at the top of the screen. Then click on the "Interface" option in the drop-down menu.

• A new window will open up that will allow you to modify your client program in many different ways including skin, text color, text background, font size, and the ability to turn on/off clan chat, broadcasts, and pages.

• Click on the arrow underneath "Skin" and a list of available skins will show up on a drop down menu. Choose the one that you would like to use and click "Apply" at the bottom of the screen. Your client should reopen and change to the new skin that you selected. Sometimes it requires you to close the program and reopen it, but usually it is instantaneous.