I'm fairly certain I've never laid eyes upon a more exquisitely-designed terrarium than this one by Paula Hayes (note: her website is amazing). It's more fancy pancy than the ones I put together around here, but I do enjoy the inspiration. I think I'll branch out the next time I re-design our terrarium and perhaps include a few things other than plants alone (although tweezers may be necessary). I have to say that over the years I've really enjoyed having it around and the vessel I purchased was definitely worth the investment. Terrariums not only add that necessary "touch of green", but visual interest as well. People are expecting a simple plant, not so much a terrarium!
Not sure how to design your own simple terrarium? Here is a step-by-step video tutorial posted by Design Sponge showing an employee of New York-based Sprout Home (love!) talking us through the process; but keep in mind this video does have music so if you're at work consider yourself warned :) For a simple how-to sans musical accompaniment, click here. It's not as thorough, but you'll get the general idea.
Terrarium sources for every budget:
Terrain / Sprout Home / Pottery Barn / Roost / Ebay
image by Eva Heyd