Windowboxes would look great on your house. I think they should match the color of your shutters or the color of your front door. You could hang one off the porch railing also.
Another Connecticut charmer on the same street. The bright green paint color on the boxes and screen door, as well as the flowers, lend miles of charm to this home. There is no rule that says you need to coordinate your boxes with the rest of the paint trim; you may choose to have them stand out on their own.