This might not be the answer you are expecting, but the best way to arrange them on a bed is that which gives you the most comfort. But you might also need to arrange the bed when you are not using it in a way that is also appealing to look at. In that case, you can try any of the standard arrangements. But this also depends on the number of pillows that you have apart from the regular pillows. If you want to make your bed more attractive, then get some throw pillows and euro pillows as well. They will give the bed a fuller look and shape.