Street openers are mostly situational. You could use an assistance opener, and build from there. You can make an observational opener, like if you're standing at a stop light that is very long, and a HB is right there, make a comment about how long the light is, and go from there, but those can be kind of boring and you won't be memorable unless you have good conversation skills or plan on going on an Instant Date.
So, here are 2 favorites of mine:
1. (If a woman walks past) Me: "What are you doing" (or where are you going?)Her: "I'm going to such and such or I'm doing such and such." Me: "You're a lousy liar......It's really ok to admit you were just trying to get a look at me... and as long as you're not a stalker, I may give you a chance!"
2. “Hey are you good at accepting compliments from strangers?” (yeah) “Sweet, me too. You go first, compliment me.”