Over at Slate.com, there's a startling slideshow of shelters pieced together by those displaced by the January earthquake in Haiti.
"... The tarps are folded, tucked, nailed, sewn, or taped in infinite configurations. Because the architects of these structures have no access to raw materials or tools, shelters are sometimes made with rusty nails, using rocks as hammers. The aid community is now working to distribute "fixings"duct tape, screws, nailsand tools."