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.
Geek up the entrance to your home by adding an enter key doormat to your front stoop. The enter key doormat is styled like the enter key you'd see on a QWERTY keyboard. You can try to convince guests that jumping on the key will open your door, too.