I'm not sure what you mean? Most of the more popular well-done themes on there give you the UI elements, and examples of how to put them all together as various types of pages/UIs. For example, here is just a quick top selling one I found: http://trystack.mediumra.re/ - It includes all the elements broken out, and then ways to form various UIs with those elements. Is that not what you are looking for? Did I misunderstand?