A Grey would look nice here, (third from the bottom left) possibly a 1/2 Strength lighter . The grey would set off the green foliage. I would keep the facia & windows 'white' and change the door to a high gloss white with a chrome handle. I would also change the porch light to Chrome and the house numbers to chrome to give the entrance some 'bling'. The shutters could remain black to provide depth/ or possibly paint them high gloss white to open up the wall space and match the front door. The shutters could be left until the end product to see whether they would require painting all together. Enjoy :) (sorry I can't stop at the walls alone :)))))