If you're looking for some inspiration for how to make a closed terrarium, I've got a fantastic video to share. In fact the channel is well worth subscribing too - the owner is from Japan and has a wealth of mosses available. His scapes are excellent and inspire me. I've always loved Japan - their attention to detail and their plants are second to none. It seems their standards are too - another reason I like this channel so much.
I hope they have the same impact on you. If you are intersted in Terrariums, we have a category specifically for them - click here to see them.