If some of your surround sound wires run across the ceiling, you have several options for hiding them. The one that is best for you will depend

click to enlarge
on your DIY skills as well as the amount of time and effort you want to spend hiding the wires. For example, if you are particularly adept with tools and such, you could cut or drill a small hole in the ceiling at each end, run a length of fish tape through it and pull the surround sound wires through the holes, hiding them nicely away in the ceiling.
However, if you are not quite that handy, you have plenty of other options. For instance, you could place masking tape vertically over the entire length of the surround sound wires and then paint over the taped wires to match the ceiling. This would also work for hiding wires that run up and down your walls.
As another option, you can purchase adhesive wire tracks at most hardware and home improvement stores. Simply install the surround sound wires into the track, peel the backing off the adhesive and mount the tracks onto the ceiling, hiding the wires in plain sight.
Photo credit: flickr.com/photos/foxmuld3r