raised vegetable garden against fence.
Turn pallets and concrete stepping stones into a bar for the patio
Herb garden at front idea Google Image Result for http://img.archiexpo.com/images_ae/photo-m2/solid-hardwood-deck-boards-ipe-70217-2153769.jpg
how to build a garden wall with railway sleepers - Google Search
Railway sleeper steps, beds and patio
Retaining sleeper walls, steps, new fence, lawn and patio.
Low dividing wall between "meadow" and "woodland" sections of the garden
Bench, steps & raised bed made of railway sleepers. Fairly plain layout but useful for ideas. Might need anti-slip coating for wet-weather. Like the bench to the right (mostly out of picture).