I think you will find these all resonate–either we ourselves are guilty of some of these or someone close to us is. Especially number 25…”the toilet rug”. Really, is that a great idea?
Take a look, the pictures really help sell that these are really bad ideas.
http://www.hgtv.com/decorating-basics/25-biggest-decorating-mistakes/pictures/index.html
place to hang art 
I must admit that in my past I too succumbed the “toilet rug”.
it seemed like a good idea…