No one really does spray bars anymore. The many brands of energy efficient propeller powerheads like from tunze, hydor, vortech etc are the trend these days. However you can make a spray bar by just drilling a lot of holes in a length of PVC plumbing mounted onto the output of a submersible pump. I actually do have one along the back of my tank behind the rocks. I use it to reduce dead spots where there would otherwise be little to no water flow. The problem with what I've done is it does create laminar flow which is undesirable and its buried... so getting to it is a PITA (which is probably why I've just left it there).
Here is what it looked like before installation.
