Follow our step-by-step instructions to learn how to create tiny terrariums, where big concepts are condensed into small spaces: http://www.midwestliving.com/garden/container/how-to-make-a-creative-terrarium/
To make a terrarium, choose a glass container with an opening wide enough for your hand. Gently add an inch or two of washed, fine gravel. Top gravel with a thin layer of activated aquarium carbon. (You'll find both items at your local pet store.