The citizens of Puerto Rico have voted in favour of becoming the 51st State of the Union. It doesn't mean they necessarily will soon, or will ever be granted such status, but it's a sure step on the road to trying.
If they succeed, as has happened a few times previously in American history, the flag will have to be changed, so that it has 51 stars for each state, not the 50 it currently sports.
To help the government out, some Redditors have played the role of 21st century Betsy Ross, and have come up with their own designs.
I like the one above, by 55555 (even if it does only have 50 stars... maybe one's already been eaten).
51 state flag [Reddit]