I agree it looks ugly, but it's only like that when I'm not in the car, so who cares anyway?
I keep the bunch of wires in my car at all times. (it's just a bundle of wires I taped together with some electrical tape at one end) When I don't use 'em, I just put them under my seat. So they don't bother me. Ever.
I still believe this is the best way of preventing someone from smashing the window to look if the stereo hasn't been hidden under the seat or something.