Reuse an old tree to make a log pathway in your garden. Good use of "yard" trees and other wood that can't be milled; works much better in climates without termites. Good drainage under the log rounds will make the path last longer.
Recycled railway sleepers stained for a raised garden bed. (I have been advised that it is best to put a sheet of plastic between the reclaimed sleeper and the soil/compost, because the tar in the sleeper is NOT good for your food plants.