I don't know about here, but most blogs the person has to decide whether comments are permissable at all and may not allow them. Then if they are, also decide whether to let comments immediately show, or to moderate them first. Which is they decide if they will let the comment show or delete it. Sometimes people post very disrespectfully, or even very ungodly things. Or it could be a glitch
The only problem with having the same background all the time there is the possibility people get too attached to it . and it can become a psychological factor that hinders change . but .. that's just my observation .