Orthodox may not. Catholics do and more - particularly in regards to Mary.
The Bible doesn't instruct us anywhere to talk to people who have gone to heaven.
But the Bible says the Kingdom is in our hearts. If God abides in us, certainbly His saints abide in us too. As +John the Forerunner (Baptist) says "the Kingdom of Heaven is at hand [near]" – all you have to do is reach for it, Blogger! Don't look up, look inside!
Tell me what the Catholic Church teaches, not what some Catholics practice on thier own. Being Catholic or Orthodox, or Protestant for that matter doesn't mean one knows his faith.
Nor does the Bible instruct us to face East when we pray, or to mark ourselves with the sign of the Cross, whether by gesture or by wearing a small cross (from ancient times usually wrought of precious metal or bejeweled as a sign Christ's triumph on the Cross), but Christians have always done so.