we have a panda bear from fisher price were she is really into and a pramchain out of wood were bells are attached which she loves!
as well she finds the sound of plastic foil amazing!
you can built an interesting mobile by yourself. just take a hanger and place objects on it! you should use strong colours and high contrasts, e.g. a pattern of a chest board, as they can see such best! pale colours they can't see properly at this age!
hope this helps
