I designed an Arduino shield to provide a lot of outputs using very few pins on the Arduino... it uses 2 M5451 35 segment LED display driver chips.
Here's the board with all the parts soldered on.
Here is a angled view. On the front you can see a lot of pads. The idea was to allow the user to choose which Arduino pins should control the board by only bridging some of the gaps. However it turns out to be very difficult to solder tiny wires across these gaps.
Any ideas on how to do this better?
Here it is shown lighting up all the LEDs I happened to have lying around.
Here is the bottom view showing the Arduino connected.
A youtube video about it: