I like to take an empty jar, put some stuff gathered on a walk through the park: some sand, a few twigs, a pebble, different kinds of #mosses, small #plants that are in the #moss already, then water it a bit and close it with a lid. Attach a LED light onto it with a rubber band or some other cheap way and it becomes a #MiniGarden, #terrarium, a #living desk #decoration, a lamp. It requires zero maintenance. When you get tired of it, you simply throw everything away. This is my newest setup:
Probably fun project to do with kids if they are so inclined. Try to notice different kinds of mosses. Can you collect all that grow in the area around you? Inevitably you will catch a couple of very small insects. Can you identify them? What will they need to stay alive? If the mold sets in, observe the struggle between different kinds of mold amongst themselves and vs the plants. If it gets boring, throw a piece of something in there and see what difference it made. So much fun - one jar!