Picture of Star of David with Menorah in Venice's Jewish Ghetto is courtesy of "Overture" from Flicker who wrote to me:
The Ghetto Vechio is really evocative of the way in which the Jews were treated in Europe during the middle ages through to the renaissance. The star, in this context, is spiritual beacon - an enclave righteousness.
This is an example of the strong link between the Star of David and the Menorah. I started collecting such examples after reading Uri Ofir's theory about the origin of this Jewish symbol from the Menorah.