I've always loved the look of glass terrariums with succulents in them. I'm not an indoor plant person, but I love the clean architectural feel of geometric succulents. Moving into a new home, and subsequently pouring over decor ideas, I finally had the motivation to tackle building some for our new home. Turns out they're pretty easy.
I've had my eye out for containers of various sizes and interesting shapes for awhile now. CB2 (affordable suspended/hanging orbs), Welks (on Main St.) and dollar stores seemed to provide the best finds for me.
I also added quartz crystals to mine, but you could add anything that fits your decor!