You know,it may sound weird but I would love to see a Black Lanterns army made of the Pre-Crisis alien race known as the Lexorians (those aliens that loved the mad scientist Luthor in the old days)
It could be explained thay they attempt to glorify their hero (Luthor) by killing all the Kryptonians left (Lexorians used to live on a world with a red sun,so there is a chance they could also develop superpowers under a yellow sun)