Brick pavers make a simple, handsome border and work well as edging material. They're ideal for a wide border that keeps grass out of the garden, yet allows flowers etc. to spill over without intruding onto the grass.
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.