This tutorial will simply show you how to change the border and form color of the DevComponents.DotNetBar2 MetroForm. MetroForm is a popular form design as it looks clean and very professional. You will need to find the DevComponents.DotNetBar2.dll reference online for this tutorial.
Follow parts of this tutorial to add the DevComponents dll as a reference.
So you should have it as a reference and this as the top of your code:

As the code to change the colors is quite long even though it is on one line, I like to refer to other specific namespaces:

You can put this code wherever you want the colors to change, I have mine in the Form_Load procedure:

The first parameter is the color of your form, and the second is the border color. I have these colors on one of my programs, it looks like this:
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WhiteSmoke background, Orange border.

If you need any help with this, feel free to PM me