If you have copper pipes, my first suggestion would be copper hardware so that everything patinas similarly. Not sure of the brand, but here's the look: https://66.media.tumblr.com/0d479315b81bdbccd58240832815640e/tumblr_n0mhmyCH661rnf3fvo1_500.jpg from https://dailydesigner.tumblr.com/post/75888550802/dolphin-court-house-by-toby-scott 

Second choice would be an oil-rubbed bronze finish, which looks like aged copper (bronze is comprised mostly of copper) so at some point in time it will complement the pipes. See https://www.signaturehardware.com/bathroom/shower/rain-showers/baudette-exposed-pipe-wall-mount-shower-with-rainfall-showerhead.html