I love window boxes. I have never had one on any of the houses I have lived in (mostly because I always lived in Arizona and there wasn't much you could grow there that didn't want to die in the 115 degree weather.
And now that I am in Texas where pretty things do grow, I don't have any windows that are really window box ready. But Carolyn from My Backyard Eden solved that problem for me:
She used an old window to make one where there wasn't and added a flower box! A great way to get that window box right where you want it.
I just think it needs some shutters.