Praise be to Allaah.
Hanging Qur’aan on the walls is not appropriate as it
involves a number of things that are haraam. These have been explained in
the answer to question no. 254.
There is nothing wrong with hanging up chains that include
blue beads for the purpose of adornment, so long as there is no false belief
involved such as the belief that they bring good luck or ward off the evil
eye. See also question no. 10543.
Nevertheless it is better not to hang up these things,
because most people hang them up in the belief that they ward off the evil
eye or protect one from hasad (destructive envy), so hanging them up is an
imitation of these people, and some people may think badly of him if they
see these beads, and think that he has hung it up to ward off the evil eye,
and some people may follow his example in that.
To sum up, there are a number of reservations about hanging
them up, so it is better not to do that.
And Allaah knows best.