Annie Thornton When it comes to the actual pillows that you will be sleeping with, I have read that it is best to pick a pillow that takes into account your size and sleep position. Then all you need to do is decide what fill you prefer. I think that most stores that sell pillows can help you out with those decisions.
As far as pillows to decorate your bed with, it definitely goes along with your decorating style used in other areas of the house. Are you a minimalist? into textures? florals? etc. Think of your bed as a way to be really bold with your decorating style but can easily be changed as your aesthetic changes.
Check out this featured ideabook about decorating your bed with pillows: