This is a simple plan that can be modified at will and starting now, will probably see the project done to install at springtime.
http://myoutdoorplans.com/furniture/woo ... ell-plans/You might run a cheap hose in a shovel trench to it for a water point. If you add an interior shelf it can become a planter. With a solar panel yard light in the roof then it would be a nice yard light. Stain on treated lumber should make it almost maintainence free. Cedar would do the famous cedar grey out in a season or two. Lots of options