My fiancé's mother taught me all about this rule when building my pots... It really makes my pots look awesome.
Cool idea for a water garden instead of putting in a pond. Can even have fish!
DIY reusing broken planters to make fairy gardens. I really want to try this. See more of them at http://www.earthporm.com/broken-pots-turned-brilliant-diy-fairy-gardens/
Drawers upcycled into a garden planter
Paint rocks with glow-in-the-dark paint! - rugged life
Recycle broken pots
Cinder block planters