The wondrous icon of Panagia Pantanassa from Vatopedi Monastery, Mount Athos. Many cancer patients have been healed through this icon
“Do you know that cancer* is the greatest sickness? Because with the other sicknesses, you don't take the issue seriously, because you hope that you will get better and usually you don't change. With cancer, however, you say 'Here it was, it's over, the lie is finished, now I'm leaving.' Men can't help you, and you find yourself alone before God. Only hope in God remains, and you cling to this hope and are saved.”
St. Porphyrios of Kavsokalyvia
*St. Porphyrios of course is referring to serious forms of cancer (though this also could apply to other serious and incurable diseases). He of course is not saying that miracles don't happen, nor that we should not seek medical treatment and that some people improve and survive. He is saying that our disease is a blessing when it brings us humility and makes us to hope in God.
http://agapienxristou.blogspot.ca/2015/01/saint-porphyrios-on-cancer.html
Lipstick looks terrible smeared on icons, crosses, the communion spoon, and the priest’s or bishop’s hand. Hand-written icons have been ruined by lipstick; and even though the cross or spoon can usually be cleaned after everyone venerates, it’s not very considerate to those who follow. What is the answer? If one insists on wearing lipstick to church, blot your lips well before venerating... Point of consideration: God, Whom we alone come before in Liturgy, is not impressed with our external attractiveness, but with the adorning of our souls in humility, good works, and piety.
After taking Communion, at the end of the Divine Liturgy, and at Vespers with a “Litya” or “Blessing of Bread", it is traditional to eat a piece of holy bread or antidoron—the left-over bread from which Holy Communion was prepared and various commemorations made. While antidoron is not the Body and Blood of Christ, it is blessed bread, and as such, we should take precaution to eat it carefully so that crumbs don’t fall to be trampled underfoot. Monitor the children as they take the antidoron, teaching them to eat respectfully.
Church Etiquette
Lighting candles is an important part of Orthodox worship. We light them as we pray, making an offering to accompany our prayers. Orthodox typically light candles upon entering the church, after venerating the icons. If a service is already in progress, and the candle stands are up front, it is a good idea to wait until after the service to light candles so as to not distract others from prayer, nor draw undue attention to oneself.

The traditional posture for prayer and worship in the Orthodox Church is to stand. In “Orthodox countries” there are usually no pews in the churches. Chairs or benches on the side walls are reserved for those who need them, i.e. the elderly, infirm, “with child”, etc. In North America, some Orthodox faithful have introduced pews into their churches thus creating the artificial “need” to figure out when to sit and when to stand. Whether a church has few chairs or many, there are times when one should definitely stand:
The beginning of the service: “Blessed is the Kingdom...”
All Litanies—The Entrances: with the Gospel and later, the Chalice
Gospel Reading
The Creed, the Lord's Prayer
The Anaphora beginning with “Let us stand aright” through the Hymn to the Theotokos
The distribution of Holy Communion, i.e. the Body and Blood of Christ in our midst, through the end of the dismissal
As you can see, this leaves little time for sitting. Whatever parish you are in, when in doubt, stand in prayer—yet remaining sensitive to not drawing attention to oneself, or blocking other's participation in the service.