Etsy seller Wearableplanter has a wide range of 3D printed planters: rings, jewelry -- even bicycle vases! They're intended for use with succulents, small flowers, and sprouts. They're watertight and translucent, and you can see the roots through the material.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.