I have seen these garlands around, but never got around to making them until recently.
I made up my own pattern, the top of the triangle is 7 inches, each side is 9 inches. Cut two triangles for each flag and sew, right sides together. Turn and press, making sure to clip the tip of the triangle to get a clean point.
I used one package of double fold bias tape to form the garland. The bias tape can hold 12 to 13 triangles spaced 1 & 1/2 inches apart.
When you're finished you get a lovely garland. Take it out for every celebration, or give it as a gift!