If you have carpet at the place where you live, then you know how dirty it can easily get.  Shoes plays probably the biggest factor in this, so the obvious way to help keep your carpet clean is to pick a place to put them by the main entry door to your home.  Luckily for me, the kitchen is by my entry door (which is hardwood floor), and the carpet begins just to the right of what you see in the picture.  A shoe rack is a great design for shoe organization.  Also, keeping a shoe rack by the door gives a constant reminder to leave your shoes there so you don't forget to do it when you come back home.