If you have the space, pool canals are fun especially if you create a flowing water effect so that you can travel around your pool in an inner tube or air mattress. This is a great meandering narrow pool canal with lush vegetation on each side creating a natural canal/river effect.
Some of these are amazing.
"This great tutorial for making tiny gingerbread houses designed to sit comfortably on the brim of a mug comes from a competition on Polish blog Cake Time." This is too cute