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!
strawberry pyramid Vibrant DIY Vertical Garden Pyramid Planter - could do this for salad garden. either put on wheels so can access all sides OR make base triangle, plant two sides and put blank up against wall or balcony rail