Because there are so many states I think it would be a good idea to introduce a standard design for State flags, that both represent the individuality of the state and its Nationality aka American. For example most UK overseas territories use a deface blue ensign with the regions coat of arms(see link).
While this is not idea for ALL US States as many don't have coats of Arms I think it is a good place to start. I propose the fallowing standard design:
I have made a couple of flags loosely based on this standard design:
New England presents a good opportunity as it is not a state but a body of states. So I have developed flags representing their New Englander identity. I have developed state flags based on defaced historic New England flags and ensigns:
There are two states which have coat of arms that I left out. Because their coat of Arms are relatively simple and work well in the form of a banner for this I designed a standard version and banner based version:
Alabama standard state flag (top) and banner (below)
Missouri banner version (note I replaced the USA seal with a star and added the red, white and blue design from the original flag. As I feel that the USA seal need not appear on it but that's just my personal taste.
I will make another post on other state flag ideas.