Several years ago I met my bishop, Metropolitan JOSEPH (Bulgarian), for the first time whilst helping out at my parish. I was the first to greet him as I happened to be outside the church entry at that particular moment. He walked humbly from a small car in the car park, approached me and inquired if indeed he had reached the right parish. I answered in the affirmative then asked his blessing. I then brought him in to the church and started to direct him to my priest. He mentioned that he wanted to go to the church for a moment before seeing Father. Thus, I helped him with his bags (I carried the case that held his klobuk). I showed him to the church. We prayed for a moment the I took him to see Father.
No, limos, escorts or rose petals. He was very much a simple monastic, not at all like what I had been thinking. As an aside, I think he also resembles St John Maximovitch.
As for rose petals, that indeed seems to be a custom in many Orthodox parishes for receiving a bishop. I'm not sure of the actual meaning or origin but it is definitely no longer pagan, if indeed it ever was. Surely, if it were problematic, the bishops would have spoken out against it long ago.
As long as a customs dosen't take on a life of its own or become superstitious there should be no problem. Amongst many Serbs there is a custom of wearing a bracelet style brojanica (chotki or prayerope). This is fine as long as the practise doesn't lapse in to the above problems. It can serve as a reminder we're Orthodox Christians and even serve as a reminder to pray and avoid sin.
In my opinion, it would be wise to discontinue or call off the practise if it proves to be divisive with in the parish. There are other ways to show honor and respect to your bishop.