So this is a quick remix I made of the PiGRRL by Adafruit. All I did was added sonic character stencil outlines to the front and back of the case. The rest of the parts are exactly the same as the ones from the Adafruit version. I want to get a Pi Zero soon to try this print out with, but being a HUGE fan of Sonic I wanted to customize the PiGRRL a little bit to my liking. I used these models to make the stencils for the case -

http://www.thingiverse.com/thing:542311

http://www.thingiverse.com/thing:545553

http://www.thingiverse.com/thing:545582

Thanks to those who made those models available, and I hope you all have fun with this!