Oh man, here are some reasons why I love them so...
You can be colorful.
You can be refined yet dramatic.
You can use just a few.. or build gradually.
You can focus on pattern.
You can focus on shape & depth.
You can group them in tight corners.
You can hang them in whatever direction you choose.
You can use them to unite spaces.
You can mix old with new. You can be organic or use symmetry. You can spread them out or keep them close. You can be comical or timeless.
Basically.. there's no wrong way to arrange one, and the key is in the selection.
Advice: Make it YOU.
I can't wait to make one ME. (: