The front panel for the BLUE computer was especially fun because it used the limited lights and switches available to the FPGA board it lived on. You can see it in a video in this post about the ...

[Glenn] snagged parts of a Grass Valley Kalypso 4-M/E video mixer switcher control surface from eBay ... of microcontrollers and FPGAs. The square panel is a “Crosspoint Switch Matrix” module ...