It is a charming quilt! I would suggest finishing the churn dash blocks and put them on the design board and step back. Are the buildings by the bird and one next to the chimney a kind of green or a type of beige/tan? Since the largest building is red and it is a strong color, and there are 2 that look green, with one partially blue or grey, I would audition a blue boarder, and see how it looks. Take a piece, maybe a fq and stand back to see if it works well.