The Navy ensign that all colonial ships had was red with the union jack in the field. Once independent the colonies broke the red field with the rebel stripes of the Son's of Liberty. All any ship had to do was add white stripes to their current flag, no new purchase necessary, and they were all set.
Being part of England was not shameful. As Tom Woods's writes in his Politically Incorrect Guide to US History, the revolution was a conservative reaction of Englishmen demanding their rights as Englishmen. Breaking apart the ensign and leaving the union jack in the corner would not have been as weird for them then as it appears to us now.
If a future American revolution ever happens, I imagine the rebels will use the Stars and Stripes in one form or another.
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