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!
I like use of rocks gravel to slow water down as it moves through landscape on slight slope. Flat stone with depression in foreground a perfect spot for bees & butterflies to get water (without drowning in a deeper birdbath)