Can't find an example of good app design?

Question

C++ / C#

Hello. There is a desire to write applications and at the same time work out with WPF. I downloaded the bass.dll library, figured out how to turn on music and so on. Now the question arose with the design of the application. I downloaded the buttons, but I can’t put it together in any way - I’m not a designer, well, no way (((Maybe there are some examples and the original design of players on WPF, the code is not needed.

Answer 1

A site to form the color scheme (gamma) of an application or site?
https://habr.com/ru/post/277399/
Where can I find design examples of modern desktop interfaces?