As has been pointed out in the other threads, the Ave Maria
is a thoroughly Orthodox (and Scriptural) prayer. The Eastern Orthodox version is usually something like this:Theotokos Virgin, rejoice, (or: Rejoice, O Virgin Theotokos) Mary full of grace, The Lord is with thee. Blessed art thou amongst women, and blessed is the fruit of thy womb, for thou hast borne the Saviour of our souls.
A variant used by the Old Ritualists isTheotokos Virgin, rejoice, (or: Rejoice, O Virgin Theotokos) Mary full of grace, the Lord is with thee. Blessed art thou amongst women, and blessed is the fruit of thy womb, for thou hast borne Christ the Saviour, the Deliverer of our souls.
There is also warrant for its use in a rosary-like setting. The Prayer Rule of the Mother of God
of St. Seraphim of Sarov is essentially an Orthodox Rosary. The main point of contention seems to be the RC use of imaginative meditations during the prayer.
Most Orthodox sources, from what I can tell, discourage the use of the imagination during prayer, following the Holy Fathers:
[Prayer] must be completely imageless and we must on no account give freedom to the imagination or allow the fancy to form an image of any saint or light; because usually delusions, especially at the beginning deceive the minds of the inexperienced with false fantasies.
Otherwise, I cannot see what would be the problem with the Rosary.
As for the beads themselves, (someone correct me if I'm wrong, but) I don't see why you couldn't use them. They are just the Western version of a prayer rope. The word 'bead' comes from the Old English (pre-Schism) word for 'prayer'. ISTM, that with a blessing from the priest one should be able to use Western prayer beads as one would use a prayer rope.