Someone asked me after my Post-Mortem article on Ludum Dare how I achieved this effect:
So here is a quick tutorial using Blender 2.69.
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Open up the default file with a cube in the middle. Edit the cube using "Tab". From the top view ("7" on the num pad), add a cylinder ("Shift+A -> Cylinder"), and in the menu (which is on the left by default) there is an option for vertices, I chose 7 for having a nice low-poly mesh (an even number is less nice, you can test it by yourself).
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Press "A" to deselect all, then move the mouse over a vertex of the cube, and press "L" and "Del- > Vertices", since we don't want that ugly cube.
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Press "1" on the num pad to go to the side view, and make sure you're in orthogonal view (press "5" until you can see the grid in the background). Press "Z" for wire shading, "B"