This is a collection of graphics for the NUI Toolkit, and in a sense are the graphics that NUIT was written with in mind. That being said, NUIT is fairly flexible, and I've provided the PSDs for all controls in the interest of ensuring that you have a reasonable idea of what each control's graphical layout is like.
Further documentation will be available later with the specific requirements for every control that uses images when drawing.
These graphics are licensed under the Creative Commons Attribution 3.0 United States license. You can read the license here here.
I've chosen to use the most lenient possible license in the interest of not hampering anyone else's work. I'll trust you to be a good person, so have fun.