The Roof of The Tabernacle

Here's another theoty about the ORIGIN of the jewish star:

Shulamit Gad quotes in her book (published in 2006) King David and the Power of Psalms in page 706 from Rabbi Yosef Bagad’s book titled Yosef Nachalah page 773 that the tabernacle's roof was covered with cut leathers in the shape of isosceles but not equilateral triangles. These triangles were placed one on top of the other in the shape of a prolonged Star of David.

Hundred Years of Religious Zionist Education Stamp

Blue Star of David on a white background on the Hundred Years of Religious Zionist Education Stamp issued on 25/07/2006.
Designer: Student Shechter Hadar who won a design competition that was held in Emuna Institute in Jerusalem. 

Franz Krausz

Photo of Stars of David on Israeli graphic designer Franz Krausz Second Maccabiah Poster is courtesy of "dlisbona who" published it on Flickr. "dlisbona" has a nice collection of posters designed by Franz Krausz (1905- 1998).