Custom Shaped Aero Windows in C#? Like THESE!

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This program also does it.

This also does it! >_< Even more...

I recently used this solution and it worked for me:

http://devintelligence.com/2007/10/shaped-windows-in-wpf/

I had to create a separate assembly containing the WPF form because the rest of my project uses WinForms. From there it's quite straight forward: Use a background image with transparency and set the form to transparent.

Though you might need to change WindowStyle="None" to something other or else you'll have no close button etc.