Treat decks and porches like rooms. Painted floorboards make their screened-in porch feel like an extension of the house.
Create a 'flex' room that can be used for guests or as a quiet spot for answering e-mail.
Keep the decor simple and orderly. Fewer things, from objects to artwork, mean more distance for the eye to roam.
Shown: A rug, table and chairs set aside one half of the porch as a separate seating area.