It would be nice to have an LED shield with 12 or 24 LED's going all around for the end of a stack (so no connector is needed on the LED side.

I would like to see a proto shield with connector on both sides so it would fit inside the stack. The contacts do not necessarily need to be "through holes" as one can solder the needed cables for the extension either from the top or the bottom. There is even no need to have ALL contacts available on both sides. This way we could have two end-stack places for display, LED.....