If you don't like the app's tile you can unpin it - personally I like having some variety to my start screen.
It would be pretty hard to enforce a lot of visual uniformity considering that live tiles are meant to surface content, including things like photos. You'd have to enforce rules on what people's friends can look like.
It would be pretty hard to enforce a lot of visual uniformity considering that live tiles are meant to surface content, including things like photos. You'd have to enforce rules on what people's friends can look like.