How to start a conversation out of the blue?

At the church I go to, there's a girl who seems to be about my age, except she's super tall. I'm talking 7 ft and only about 18 - 20 yo.
I've heard that girls like that can be treated like freaks and outsiders, but I actually think she's attractive (I'm about 6.4 ft so not that short). I wish we could at least just be friends, but our social circles have almost zero overlap and we only pass each other occasionally without talking or even making eye contact.

So is there anyway of starting something? It seems like it would be awkward to just say "Hello. My name's ______, what's yours?"
How to start a conversation out of the blue?
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