Good suggestion, I haven't thought of this until now. Now that we're at it, can you please suggest flags for other Spanish dominions: Puerto Rico, Dominican Republic and Philippines?
Sure!
About Puerto Rico... i think that during the short living spanish first republic (1873-1874) there was a project to grant some kind of autonomy to puerto rico and this flag was proposed:
but the problem is that the coat of arms of that flag is the first republican one, which doesn't fit very well in this mod, that's why i made some re-interpretation of the flag and planted the monarchist coat of arms just in the middle of that flag having this as a result:
alternatively you could always use the provincial maritime flag of puerto rico, but it's not as cool as the other ones.
EDIT: Forget about the second shoped flag of mine, the first one was the true colonial flag of puerto rico from 1873 to 1898, however there's one thing that doesn't fit IMO, and it's the crown in the coat of arms, it's the silouette of a castle, and that's the traditional symbol of the spanish republicanism... that's why i think that maybe replacing only the silouette of the castle walls with the spanish crown maybe would not be a bad idea...
Sources: http://www.crwflags.com/fotw/flags/pr_hist.html
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