Summer Impatiens blooms
I've kept Impatiens growing indoors for a little over two years, since I pinched a couple pieces off outdoor plants. They've gone through a couple prunings, but I'm really happy with how they look now (I have two; the other one is budding but not in bloom yet). They almost look like little flowering trees!
They're easy to root, they branch on their own, and once they start flowering, they don't seem to stop! Quite an enjoyable houseplant.