Instructables
This is just a display of some terrariums that I made as gifts during the holidays.
The materials are pretty straight forward.
Small crystal jar or container (this are the only materials that I bought, 1 dollar at a thrift store)
Sea pebbles 1/4" to 1/2" dia. for the bottom
Sea Rocks 1" to 1 1/2" dia.  For single top (some of the rocks has small holes in them were seashells use to live, I put a bit of ground moss in them)
2 types of Moss (tree moss and ground moss)

These would make for great terrarium gifts because they're simple, attractive, and easy to maintain.  They won't frustrate the person receiving one.  It looks like you used some sort of lichen and cushion moss?  I'm not good at moss/lichen identification.  It's not often I see moss growing around here.  Very attractive choices though, and green has been associated with feelings of peace and contentment which is why people are encouraged to grow green plants indoors during the winter besides the other benefits.  The reddish veined rock is very cool.  That's a nice choice for a focal point.  All around, smart, easy, attractive, awesome.  Good job!
 
cool! Nice thing to have in a bedroom next to the alarm clock or something for display.
Very pretty.  when I was a child, we put a little water on the garden and then a  lid on the jar.  The moisture evaporated into the garden bit by bit.