Using a transparent IKEA clock and RGB leds, I can change the color of the clock according to the traffic status to my way home ;)
Make sure to install TImeLib library in your IDE
ino - 4.97 kB - 10/09/2016 at 11:15
First you will have to solder the 12 RGB LEDs in parallel, stripping out the three wires (5v, Gnd, control), then test the LEDs before sticking them to the back of the clock.
Cut down small pieces from the double face tape and place them adjacently to the 12 clock numbers (Figures), then stick the 12 LEDs on them.
Make sure the three stripped wires are clear and little bit tall to connect them to Arduino & 1Sheeld.