American version of the 2nd flag. I really like this (they need to fix Alaska and Hawaii though)

Edit: a Brazil version and an alternative US version

Europe needs a better flag, the 12 star one is kinda boring. I suggest a modern version of one of these:
1920 European flag proposal, with every countries flag arranged radiating out from the center. I think this looks tuff, it just needs to be reworked with modern flags.

1951 flag of Europe proposal by Salvador de Madariaga. It has the geographic location of each capital as a star in a constellation (the big star is Strasbourg). Again, I think this looks really cool, it just needs to be reworked with the new capitals.

1951 flag proposed by Hamries. The Es stand for Europe.

Which flag do you think is best? There’s a whole list of potential ones here, check it out: https://en.wikipedia.org/wiki/Flag_of_Europe
These really do look pretty, especially Brazil's