Retaining sleeper walls...DD: Before and after pix of creative outdoor living ideas many for small spaces.
Silver Grey Indian Sandstone Paving slabs 900x600 Large size paver slabs in Garden & Patio, Landscaping & Garden Materials, Paving & Decking | eBay
Railway Sleepers - New Soft Wood « Landscape & Builders Merchants
Small Sloping Garden Design
Keeping it simple but very stylish - multi level contemporary garden, using white to cover a multitude of surfaces and unite the look, hip or what.
photo of split-level garden and decking railway sleepers raised borders