Siao & Gayle saw lots of potential when they moved into their hillside home 2 years ago. They've renovated much of the interior, but out back reminds them of a prison yard. Landscape Designer Sara Bendrick plans to change all that by ditching the chain link fence in favor of a sleek wooden fence with embedded marbles. She'll also build them a cantilevered deck to expand the living space, and a vegetable garden made of stacked railroad ties that will double as a privacy fence.