Just had a go at making a couple of roundels from two rather simple, but striking, flags on that list. First is from the flag of the Federal League, which existed between 1815 and 1820, and is now part of Uruguay. It is often call the Artigas flag, named for founder José Gervasio Artigas Arnal

Second is the flag of the West Indies Federation, which was used between 1958 and 1962, in an attempt to unite various British Caribbean islands.
