How the Israeli Flag was chosen
According to David Wolffsohn, who attended the First Zionist Congress in 1897:
At the behest of our leader Herzl, I came to Basle to make preparations for the Zionist Congress. Among many other problems that occupied me then was one which contained something of the essence of the Jewish problem. What flag would we hang in the Congress Hall? Then an idea struck me. We have a flag--and it is blue and white. The talit (prayer shawl) with which we wrap ourselves when we pray: that is our symbol. Let us take this talit from its bag and unroll it before the eyes of Israel and the eyes of all the nations. So I ordered a blue and white flag with the Shield of David painted upon it. That is how the national flag, that flew over Congress Hall, came into being.
Therefore the Israeli flag is a reminder of the faith and prayers of the Jewish people that have for so long cried out to G-d, that He may Redeem His people Israel. Now that the remnant of Israel has been Returned to its Land, and Jews worldwide need only pray to themselves that they should fulfill the Will of G-d, the Israeli flag should be a sign to them that Israel is where they belong. And the flag should be a reminder to Israel that it is the nation of G-d.