We just moved our office into a larger room that does not have a phone jack. That means running wire from the other room for the modem and phone. Two ugly black cables hanging down were not the ideal, however. So I painted them dark green, and made some paper flowers on green pipe cleaners, then wrapped them around both cables, so it looks like a flowering vine. It’s still there, but now it’s decoration instead!
While flowers and pipe-cleaners may not be to your liking, this technique demonstrates how sometimes the best way to draw attention away from unsightly things is to draw attention directly to them.