The heart-warming quote from Tehillim 137 "If I forget you, Oh Jerusalem, let my right hand forget [its skill]" expresses how many Jews feel about the Holy City. A groom smashes a glass under the chuppah to remind himself and everyone attending that the Temple of Jerusalem is still destroyed. Jerusalem will always be part of the Jewish people and hold a tremendous significance to them. Many couples like to express this in including the walls of the Old City in their chuppah.
This can be nicely combined with two white doves, a Torah scroll, a Magen David, etc. The name of the bride and groom as well as the wedding date can be added in the middle in a circular way matching the design.
