Love the half wall and Iron with Pillars. got to do this on the side of my Patio area from the house to the back fence. using Cinder Blocks and Short Wrought Iron Fencing from Home Depot ad light posts on the pillars.
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!