There are several applications that shows a set up with Fluent theme. However, the applications are quite complex and has a theme changing mechanism implemented, so I am not sure how useful they will be for a basic set up. One of those is the demos application. You can check how to get its source in the Installing WPF Demos
What I could recommend you is to follow the steps in the Setting a Theme
article and apply the approach shown there in a fresh project with the controls you want to use.
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