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.
If DIY is your thing and you are looking for a summer project, take a look at this mid-century inspired bungalow for your backyard. How great would it be to have a little spot like this in your yard to spend a summer evening?