Terrariums.

My son's terrarium.  I don't know why the picture is distorted.

My daughter's terrarium from the side.  It's kind of dark.

My daughter's terrarium from the top.  There are seeds planted in the soil area, that hopefully will grow and fill that in.

A tiny necklace terrarium my daughter made, with some moss, some dirt, some sand and a tiny seashell from the gulf coast.  :-)