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!
Garden markers add personality to a garden and help you remember which row is tomatoes and which is peppers. Gather (or purchase) river rocks, some paint markers (pick up Sharpie brand at The Home Depot) and create these cute river rock plant markers.