I can’t find any information on that topic. I know how to use custom skins with legacy UI where I would manually create UI components in OnGUI method and assign appropriate skin in mentioned method. But I don’t know how to do it with new 4.6 system. Is there any tutorial on that matter?
You really won’t find much as there is no skin element on the new UI. If you want all buttons to look the same just create a prefab button or even just make one and ctrl + d to duplicate.