The sound of running water is soothing and can add tranquility to any landscape. You can either pair a landscape waterfall with a pond or create one without a pond. These instructions describe how to design and build a waterfall without a pond.
DIY - Homemade Gabion wall ie rocks encased in wire baskets and used as a retaining wall - creates a dramatic feature in a garden. No directions on link. Nice someone figured out how to landscape with river rock. I swear they grow!
DIY: Branch Chandelier -- easy to make from found wood and a string of outdoor globe lights. Perfect for a covered porch or a terrace/patio with an overhead trellis. I could do this on the porch if I have any picnics come summer.
DIY Outdoor Solar Light Display : 2 fence posts + 4 solar outdoor lights + 8 extra long screws + an long scrap of treated x wood. great idea for the deck or patio! Would probably use nicer solar lights!