The 1-15 population is pretty spread out on Green these days, but if you are dead set on going to zones that already have PUGs available - Unrest starts at around 12-15.
Here are some places I've seen pretty consistent pick-up groups happening on Green the last few months:
12 - 30: Unrest
20 - 40: Mistmoore
20 - 30: South Karana aviaks
25 - 35: Highkeep Goblins
40 - 50: City of Mist
50 - 60: Velketor's Labyrinth
50 - 60: Karnor's Castle
I've also seen the rare group in places like Befallen (5-20), Najena (15-30), Solusek's Eye (25-35), Nagafen's Lair (35-60), Splitpaw (30-45), Crystal Caverns (30-45). This batch of zones is typically pretty empty, and it seems to be a BYOG situation, rather than PUG.
But as kjs said, that duo can fit into a group nicely, or you can pick up a monk, warrior, ranger, pally or SK and hit one of the many other zones.
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