As a follow-up, not a history lesson, but a vexillological pop quiz!
You are right that red, white, and blue, were popular during the French Revolution -- in fact, pretty much universally (for religious reasons), so the question is:
How many flags contain neither red, white, nor blue? For the purpose of this question, I do not distinguish between shades of the same colour, so both France and Sweden have "blue" in their flag. Bonus points: name the countries! Tip: This question may or may not contain misleading clues.
melroy