Very pretty!
I would use blocks to border it. Perhaps a narrow (1.5") black border, then small (6") 9 patch blocks in red and tan, then another narrow black border ... that will give you 48" ... on the two sides that need to be longer I'd add a row on each end that are red and tan stripes but at the top of each add the star (or top of one and bottom of the other so either way is "up") ... kind of mimmicking the flag (star - stripes).
Last edited by DogHouseMom; 09-04-2013 at 03:16 PM.