Derived from a complex Cube.
Thickness: 2~5 (organic)
At the bottom there is a cut hole of 25mm (1") for your light fixture - Use Cree LED or 40W lamp
3D Print it with your favorite material (White Nylon recommended but the low cost "full color" gypsum is great too - See example here: http://www.ponoko.com/design-your-own/products/voro-lamp-shade-180mm-math-decor-by-dizingof-9415 )
Or 3d print it with ABS/PLA on your personal 3D Printer.