Wooden stepping stones amongst the plants
curved retaining wall from railway sleepers on end
If we used raised beds, this image made me think of the upturned logs you get in kids playgrounds so they could be decorative as well as used for play....
Build a Wood Timber Retaining Wall DIY
Built-In Planter Ideas • Projects, Ideas and Inspiration! Including, from 'garden gurus', this lovely built-in planter made from rail ties.
Upright railway sleeper garden bed
Fiona Brockhoff Design - retaining wall / garden bed idea
DIY retaining wall system
design for railway sleepers to enhance garden stream bank - Google Search