Not the walls, but steps similar to what I have drawn in plan view so far Check out retaining wall projects from exceptionalstone.com!
Build a backyard retaining wall with concrete blocks and then adorn it with stone facade. Nice!
Interesting ideas for you garden
landscaping idea - eff you, hill
Tiered Garden wall with stairs - plans for the backyard near course and water (except sod).
Using stacked stone for retaining walls allows use of larger stone within the wall to add design appeal.
Original and Cost-Effective DIY Retaining Ideas for Creative Landscaping - View Crafts
Cool bench in retaining wall.
Landscaping Retaining Walls Pictures Ideas | Design Ideas & Decors
cheapest retaining wall - Google Search