Opt for a natural-looking porch with a neutral color scheme. More ways to create an outdoor retreat: http://www.bhg.com/home-improvement/porch/porch/outdoor-porch-design-and-decorating/?socsrc=bhgpin100212neutralporch#page=3
The screened porched is a mix of dark green paint colors. Recreate the palette with Benjamin Moore's Cedar Path 454 on the walls and ceiling, and Farrow & Ball's Studio Green, an almost black green, as an accent color. For more options, have a look at our Gardenista post Seeing Green: Architects Pick the Best Exterior Green Paints.