Since it has a blue blade, I might suggest either AquaMan or the Blue Lanterns. I guess AM isn't really blue, but he is in the water. And the Blue Lanterns are really cool. They are Hope. I agree with MofM though, Egyptian would be awesome.
Its funny because blue lanterns are my favorite corps and my favorite hero is the flash! Ill debate between that or an egyptian theme. I think you really narrowed down what I want to do! No matter what it will be worn down which would just emphasize Hope. My second favorite lantern corp is red and I like the relationship between Saint Walker and Atrocitus.