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The use of ossuaries is a longstanding tradition in the Orthodox Church. The remains of an Orthodox Christian are treated with special reverence, in conformity with the biblical teaching that the body of a believer is a "temple of the Holy Spirit" (I Corinthians 6:19, etc.), having been sanctified and transfigured by Baptism, Holy Communion and the participation in the mystical life of the Church. In Orthodox monasteries, when one of the brethren dies, his remains are buried (for details, see Christian burial) for one to three years, and then disinterred, cleaned and gathered into the monastery's charnel house. If there is reason to believe that the departed is a saint, the remains may be placed in a reliquary; otherwise the bones are usually mingled together (skulls together in one place, long bones in another, etc.). The remains of an abbot may be placed in a separate ossuary made out of wood or metal.
The use of ossuaries is also found among the laity in the Greek Orthodox Church. The departed will be buried for one to three years and then, often on the anniversary of death, the family will gather with the parish priest and celebrate a parastas (memorial service), after which the remains are disinterred, washed with wine, perfumed, and placed in a small ossuary of wood or metal, inscribed with the name of the departed, and placed in a room, often in or near the church, which is dedicated to this purpose.
(wikipedia)

In WS another two complementary photos.