I have no idea what are these Stars of David for, but they convey the meaning of private (not commercial or institutional) relationship to our national emblem.
This blog (by Zeev Barkan) is dedicated to the Star of David, its history, its various meanings and usages in different cultures. It includes thousands of pictures of Star of David, six-pointed stars, hexagrams, Solomon's Seals, Magen Davids and yellow badges,and served as a resource for three books and four art exhibitions.
I have no idea what are these Stars of David for, but they convey the meaning of private (not commercial or institutional) relationship to our national emblem.
Photo of a yellow Shield of David is courtesy of Amit Mendelson. The gate is at Shukri 11 in Haifa.
Copyright: Amit Mendelson 2008.

Photo of a decorated Gate with a Star of David is courtesy of Amit Mendelson. The gate is in front of the building in Zebulon 11 in Haifa.
Copyright: Amit Mendelson 2008.
Safed Postage Stamp from 1948 decorated with Stars of David is published here courtesy of Itamar Karpovski. Designed by the legendary illustrator Aryeh Moskovich.
From Wikipedia / Postal history of Palestine:
In the town of Safed, the departure in April of the British left the Haganah trying to establish control. The Haganah enlisted a postal clerk to print up postal envelopes, which were never used, as well as 2,200 stamps (10 mils each). On the stamps was written, in Hebrew: Safed mail Eretz Israel. Once stamped, mail was routed by the Haganah through Rosh Pina. These Safed emergency stamps were the only ones issued by the Haganah.