I was at a client's site today and saw their front computer where the point of sale is and see how it looked.
It's one thing to keep on their desktops a few important files and folders, but this is very confusing at a spot where you need everything to be as simple as possible. Please do not worry if it looks boring, its suppose to look like that.
On the point-of-sale system, I suggest that you keep it as simple as possible, with as few items as possible on the desktop as all you are going to do is confuse people. If you need more on the screen, create folders and as many of the programs as possible into them so clearing up the main screen. If that is not good enough, and you really want a better way of cleaning up the screen, I suggest you look at something like Fences.