I'm not shy to bring up my childhood fascination with plastering glow-in-the-dark star stickers all over my room. Other kids had nightlights; my room looked irradiated. Someone like-minded must have made these PlanetaRoom floating planets, as when I saw them I couldn't help but get a little excited.
Nothing fancy here: just fill the balls with helium and they'll drift around. When it gets dark, however, you'll have a floating lamp of the Earth or even a globe that mimics city lights on its surface. They're only $20 and probably Japan-only as well, which might be for the best as everything in my house would be falling off shelves and counters, nudged by gently floating planetoids.