Of course I can. Here are some of the most commonly used openers, so you can see what works best in each context. Then you can use the lines that I suggested above to keep the conversation going.

1. Hey! (name) it's been a while, how have you been?
2. (name) I heard you did (thing they did), what was that like?
3.  Excuse me, I couldn't help but notice (thing you noticed), I also like (thing)!
4. (name) I'm heading away this weekend, have you got any plans?
5. Long day? 
6. (name), you like (thing) right? Well have you seen that new movie about (thing)?
7. I know this might seem really random, but (insert question here)
8. Hey, (name), you're good at (thing) right? Would you mind being able to give me a hand with (thing) real quick?
9. I swear this weather is never going to end, gosh, I'm freezing!
10. Did you get up to much today?

But remember, the best conversation opener is to smile and be yourself.
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