Although a metal chain hanging from the roof has potential to look rather industrial, this exterior seems to embrace the rugged feel quite well with the help of the various metals used in throughout the architecture.
Trellis used to cover rain gutter - could also use above a rain barrel.
Geo Chimes - anthropologie.com (via @sfgirlbybay / victoria smith / victoria smith )
Industrial Rain of Scales by Seren Fey
metal chain curtain
Driftwood rain chain with industrial elements
Found it at Wayfair - Gutter Installation Clip Rain Chain
Industrial looking rain chain. Made from repurposed corrugated steel, aluminum, and stones.
Vintage galvanized rain chain ; Gardenista