I think colored harps are tasteless, and the coloring must affect the sound, being an additional layer that maybe equivalent to polyurethane in being absorptive of sound, or inhibiting its transmission. The Salzedo model was specifically designed by a renowned fine artist with Salzedo to look as it does. I don’t think anyone should ask to alter that design at all. I think color is a distraction. I think we should all be more respectful. If a new harp is designed to come in stripes and all colors, then that is suitable to that model, if it works esthetically. If you’re playing commercial music like rock and roll, it doesn’t really matter. What would a blue piano be like?
Instruments are naturally finished to call attention their wooden nature, which is essential to musical expression. A man and his hand-made instrument making hand-produced music is what it is all about. What you can do with your hands and wood. Even a black finish is somewhat of a departure from that, unless you have a solid ebony instrument. Black is a formal color, and the most unobtrusive, so it is acceptable.
Electrified instruments are no longer natural in that way of thinking, so do what you will with them. They are about artificiality.