You Guys. Talk about an easy and effective way to add some interest and life to a space! Also, if your thumb is not-so-green, like mine, these are really simple to care for. Like the sound of this? If you choose to use air plants you don't have to do anything for them but spritz them with water. I know. Pretty awesome. 
Want to add some whimsy? Maybe add a dinosaur or animal figure munching on the stem you accidentally (oops..) broke off. 
Check out these links for ideas and tips on creating your own terrariums:
Step by step tutorial on how to make a terrarium
What plants to grow in closed terrariums

I found the pattern for these guys on the blog "welivedhappilyeverafter.com'".  I have to take a moment to give some serious blog-love to Hannah because her site has some fantastic original sewing patterns as well as lots of neat DIY ideas- you should definitely check it out! :)
I used some textured dimple-dot fabric for the back and felt for the underside and added a detachable hello kitty hair bow for the necklace and bow-tie just for fun (my nieces are in a huge hello kitty phase right now!). These guys were so fun and easy to make that I started with one and ended up making a whole family of monsters. Best of all, the girls LOVED them!! (seriously, they were absolutely mauled).