I loved this idea soo much that I decided to make one for myself. I opted for some small plastic dinosaurs; I got a pack of 12 and I'm going to switch them out every couple of days because they're so cute!

My moss terrarium was basically free because the large glass container was given to me along with the rocks, the ground and moss/clover is from my backyard as well as the cedar branch. The only expense was the 1$ for the plastic dinosaurs :D