What a charming way to fill a blank wall in the garden! Could rely on the gutter for occasional water sound, or pipe it for continuous water flow....I'd paint each one a different color. No not rainbow colors, though that might be interesting.
Flower Bed Ideas for the Front of a House Facing East
Lay the drainage pipe in a fabric lining in the dug ditch. Place drain pipe atop fabric lining, then add gravel, covering pipe completely. Leave approximately 5" between top of gravel and ground surface.