You may change the appearance of QTRgui by changing it's "skin". Skins are changed from the View/Skins menu. There are several "built-in" skins you can choose from. Simply click on the skin name. (The current skin is indicated by a check mark.) There is also a Custom selection. Clicking this selection brings up a dialog which will let you load a skin from a file. The QTRgui skinned appearance was created with tools by Almediadev. You can find additional skins on their WEB site in the Downloads page. You should download the Compressed Skins collections, as the Custom skin requires the skins to be in compressed form.