Rain chains

[Jeff Handy]

You can hide a downspout inside a false column or pillar.
Made out of treated 1x6 ripped down to size.

Or use a hollow architectural pillar or column, which are made of pvc or other plastic or synthetics, and are hollow.
You can hide a piece of flex pvc tubing inside.

You can also use the decorative vinyl or composite sleeves that are made to slip over a 4x4 post for a deck or a pergola.

 

[Eddie_T]

Or just make the best of it

 

[Jeff Handy]

Instead of the watering can, it should be a Sasquatch taking a huge piss.