No pics, but crown moulding will do wonders for you. At the points you want to go down the wall, bore a hole just below the top stud and snake the wire down the wall to an outlet. Using this method you can go all around the room. Same method works for block construction, but its a tighter fit on exterior walls.
Also, RBH's new
CinemaSITE system uses this cool cable hiding system that works with crown moulding. I'll try to dig up for you.