I created the nametag from random electronics I had in my bedroom and using a 3D printer. I took two breadboards and cut them so that they would fit in the case. I then created a design that used exactly 27 LEDs (the number I had left in an Arduino kit). Next, I created the circuit and soldered the LEDs and resistors to the breadboard. Only then did I find out that the 3 blue LEDs were diffused, which is why they are so much brighter than the others. I used TinkerCAD to design the case and had design the letters as well as holes for the LEDs to fit into (this was probably the hardest part). I printed the case on an Ultimaker printer and assembled the enitre thing. There is a button on the side, that turns on the lights when pressed (by closing the circuit). I powered the circuit with a 5V battery stolen from another circuiting kit (not the most efficient method, but effective). I then hung the nametag from a CERN lanyard and sported it at CPW. You can see the interior in the photo.