Tree stump turned dining table - If you have the space and the stump, then I can't think of a reason not to make this Secret Garden-esque table. A leveled tree stump with a DIY poured concrete top, offers up a table worth drooling over
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.