Basically, take anything with a tray, bowl, or concave cavity and fill it with dirt. Then, drop some seeds in (try Garden Cress, like the keyboard above), or re-pot a plant (like the Bonzai in the blender). Tend to your new greenery and enjoy the simple pleasures (and health benefits) of living with plants.
Why not make a planter out of...
• A Keyboard, like in this prank on Reddit.
• A Vintage Refrigerator Drawer, like Apartment Therapy's Amber Byfield.
• A Blender, like Riner Rosing of Core Since Eighty-Four.
• Old Car Parts, like we spotted at Flora Grubb Gardens.
(Images: As linked above)