Baron Opal said:
There are only the Green Lanterns, with one "Yellow Lantern", Sinestro, who is a fallen Green Lantern IIRC. He had some help fabricating a yellow power ring from a (personally) unknown source.
The ring was made by the Weaponmakers of Qward, whom, pre-Crisis, were the anti-matter universe's parallel of the Guardians of Oa. Post-Crisis, I'm not really sure what their deal is, but they apparently still exist somehow and made that ring, so presumably they could make more.
Also in the Silver Age, a Bizarro Justice League was created by some accident or act of an evil nemesis. I can't remember. Regardless, one of the members was the Man of
All Fears, Yellow Lantern. Unfortunately for him (or maybe him am fortunate

), his ring ran out of power after 24 hours, and no counterpart
lantern existed. (If I recall correctly - this is very dim in my memory - he DID manage to charge it off of a regular GL lantern and get an additional 24hrs in a later story.)
Star Sapphire wields pink energy through a sapphire either in her tiara or at the end of a rod, depending on which version of her and when. The stone, and the pink energy, was bestowed on her by the Zamarons - the long estranged females of the nearly-immortal Oan race.
Obsidian, the son of the Golden Age GL and Posion Ivy, was like his sister Jade born with light-related powers inherent within. Unlike Jade, whose powers are virtually a built-in GL ring, his powers involved the manipulation of
shadow in a somewhat similar fashion.
In my personal fan-fiction stories, in which I attempted to create a parallel to DC Comics not completely screwed up by continuity inconsistencies, Crimson was the son of slaves freed in the Civil War who gained a red ring and a mysterious flame in a crystal (actually a highly advanced alien power cell) in a manner that was something of a cross up of the origins of Alan Scott and Hal Jordan. In addition to giving him powers similar to a GL, it extended his lifespan a great deal - to the extent that he fought in Team Liberty in both WWI and WWII. Ultimately, though, age caught up with him a bit, and he passed it to his daughter, Ruby Tuesday, in the late 50s.
Oh, and I'd like to ditto those who have said, "It's yo thing. Do whatchawannado."
