Not the walls, but steps similar to what I have drawn in plan view so far Check out retaining wall projects from exceptionalstone.com!
Terraced backyard More
backyard kids play area ideas | The steep gradient of this Double Bay garden rendered it inaccessible ...
great idea! fire pit area built into hillside, retaining wall=seating area
inspo... backyard designs with terraces on hill slopes http://www.lushome.com/25-beautiful-hill-landscaping-ideas-terracing-inspirations/148719
This terraced garden, designed by Julian Tatlock Garden Design, made use of natural slopes to create a beautiful set of terraced plant beds.
backyard ideas...The San Francisco Envy Chain - NYTimes.com
Breathtaking natural stone walls in the garden. We can make this your reality! Landscape St. Louis: http://www.landscapestlouis.com/contact/
We are doing this in our backyard - we already have the terraced steps and slope - just need to find a slide that's long enough...
terraced retaining walls | Terraced Retaining Walls w/ Steps