MOAR MARS
Here are thirteen flags for the
Confederation of Avalon, a conglomeration of colonies in and around the Hellas Basin on Mars, originally established in 1984 by the Commonwealth of Nations. Long story short: Britain stays out of the EEC from the very beginning, turns the Commonwealth of Nations (sans India and Pakistan) into its own free trade bloc with blackjack and hookers. Britain's space ambitions become the combined effort of the
Commonwealth Space Agency - aluminum from the West Indies, test sites in Australia, equatorial launch sites in East Africa, sea launches in the South Pacific, Canadian R&D, etc. And through this cooperation, eleven colonies were established on Mars. Avalon was one of the four "Great Nations" of Mars established in the 1980's, along with the Tharsis Commonwealth (United States), Kasei Federation (Japan) and EuroMars (European Union).
The official Avalonian flag is of course patterned after the British red ensign, with the blue and yellow flag of the Commonwealth of Nations in the upper left-hand corner. To modern Avalonians in the 23rd century, the blue is interpreted as representing Earth; the yellow rays stand for the many nations on Earth which made up the Commonwealth (represented by the yellow "C"); and the red field of course represents Mars. While Earth is far away and Mars is all around Avalon, Earth is always with Avalon; the Commonwealth may be gone, but Avalon carries on its legacy on Mars.
Antillia was established by the West Indies Federation (which includes Belize and Guyana).
Arcadia is a Canadian colony (it got awkward after Quebec seceded in the mid-90's, but French-Canadians on Mars have opted to keep their Canadian citizenship rather than hitch a ride back to Earth).
Darwin is the British colony (and the largest, not that it matters, right?).
Mkutano is a joint Kenyan and Tanzanian colony.
Sango is a joint Ghanian and Nigerian colony.
Sempadan is a joint Singaporean and Malaysian colony.
Sunon was established by the Republic of Hong Kong and Macau (Thatcher argued that that pesky treaty was with the Qing Dynasty rather than the PRC; PLA responds predictably, but the armies of the Commonwealth rally at the mouth of the Pearl River to back up Thatcher's Insane Troll Logic; Americans back up the Commonwealth, and Beijing reluctantly permits HK to have banana).
Tagaroa is a small joint colony of the Solomon Islands, Fiji, Tonga and Vanuatu.
Uluru is an Australian colony (also Nauru and Papua New Guinea's colony, kinda).
Wheroteao is a colony of New Zealand (and also Niue, Samoa and Tuvalu). And finally,
Zimbavoku is a colony originally established by Rhodesia (Mugabe falls down a flight of stairs in '67, Muzorewa rolls all sixes, gets the country over the whole Apartheid thing, decides to keep the name "Rhodesia" because it's already printed on everything; Zimbavoku has an equal white-black population and is intended to be a symbol of cooperation and brotherhood for Rhodesians back on Earth).
These flags were originally designed and introduced in the 1980's, and almost 300 years later, remain flying on Mars in the year 2285. Terraforming has flooded the Hellas Basin, and time has led all of these cultures mix and mingle together into a single "Avalonian" people, though the descendants of these eleven colonies take great pride in their regional heritage, as well as their historical connections with the Commonwealth. Avalon is part of a larger pan-Mars polity known as the Martian Assembly, and has a population of around 418 million as of 2285.
Since the original file was too chungus to post in full, I've split it in half.