There is, but it is not an easy task ;)
This is Windows specific: You can Override the drawing of most parts of A Window via the WndFunc, but that is time consuming and error prone. And you can also use the XP Theme Engine to draw your controls , but you still need to know about win32 internals.
You might be better off just making your own gui via a canvas.
Btw, there are tools that hook into your app and "skin" it for you, like WindowBlinds, or ShellWM (the latter is open source, so might be worth a look)
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