One of the simplest ways to enclose a space is with fabric. These three styles offer shade while adding a little drama.
Long lengths of silk can hang over a clothesline strung between the house and a pole anchored in the backyard. Secure the sides to a fence or a roof overhang with sturdy spring clips.
Similar to shown:
Silk Scapes in Sea, about $50 for a 3-by-9-foot piece; sarahssilks.com
Everbilt Wood Clothespins, about $2.35 for 50; homedepot.com