This is a small mosaic (a little over 200 pieces) of an American flag. It
uses plates for the star field and bricks for the stripes. It measures 13
bricks high, 28 studs wide, and 2 studs deep: http://www.hafhead.com/lego/mymisc/flags/index.html
I also used a cleaned up version of one of the images to make a tiny flag
banner that I have placed on my root lego page. You can see it here: http://www.hafhead.com/lego/index.html