Here is an idea of what you could do with the greens lanterns at the beginning of the universe:

At the Dawn of the creation of every universe, 2 beings were born, both possessed great power and control over light. When other weaker beings started to be born, one of the beings used their powers to control and enslave, whilst the other used their power to assist and help them. A great battle ensued to which one of the brothers was sealed away, in the universe where chaos reigns (Flashpoint, Overman, Crime Syndicate) the good being was sealed away, whilst in the universe where good and heroism reigns (DCAU, Kingdom Come, Earth 0) the dark being was sealed away, the beings before hand had already created rings of power and had created 8 planets to transport the rings to their users, the planets were called, Mogo, Moyo, Mobo, Moro, Molo, Mooo and Modo (It's not called Moso because, given what their derived from, it wouldn't make sense for the beings to know who Sinestro or the Star Sapphires were/are, also I didn't want to call a planet Mofo, and can someone figure out a name for a greed planet that isn't the same as Mogo thanks) the being of darkness watches whilst their universe crumble into chaos, whilst the good being prepares the universe for their inevitable return using situations like the Blackest Night and Volthoom to prepare the light bearers to join forces with everyone to destroy the dark monstrous being.

Makes sense?