That said, I find them like book ends that focus the eye. They also give the home's exterior a bit of personality. Whether through the flora used or the vessels, it adds a bit of flair. (OK screaming stylists who totally disagree. Stay with me.) Of course, they can be "done ugly" but so can just about anything as decorating goes.
Check these non-obtrusive versions. They add a bit but don't "say" too much. I'd consider these training wheels into the world of topiaries.
Now, these ubiquitous potted numbers were all over London. You couldn't swing a pint without hitting a door with one, in fact. This tailored yet chic door decor is like a Hermes bag. Hard to argue with a classic.
But to really make the case, check this out. This is a private home in Kensington (probably some footballer's home). The topiaries go up to almost the second floor, absolutely gigantic. What guts it takes to do this... And how much do I want to be invited to dinner?
Now, if the symmetrical or architecture gets to you, consider putting up something like this...Just one mind you... Picture taken at the really great shop, Dayles Ford Organic in too-chic-to-be-true, Belgravia.
Let me know how it turns out...