I am a bit partial to this green vintage for everyday use. Looks practical too as the spout is long, just right for getting underneath bushy plants.
The crème de la crème of the bunch are these two. The first being sterling silver by Christopher Dresser for Liberty and Co back in 1910, and the second being a stainless steel number from Anders Ljunburg. At first glance it is not evident that it is a watering can which is why I like it so much.
The wonderful Victorian silver and brass would be just perfect for you to water your parlour palms in the breakfast room.
Finally this modern design from Pascal Charmolu is just a masterpiece of design with the handle and spout being one!