MCR FRED in CSS
Cube outlines background with linear-gradients and lots of trial and error.
Hexagon drawing help from http://jsfiddle.net/CreativePunch/PjK84/light/
Little blog post on making this: http://brianbar.net/2015/08/mcr-fred-logo-and-background-in-html-and-css/
A Pen by Brian Barnett on CodePen.