For Luna I used the Neeya skin
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I went into the surfaces tab and just changed the diffuse from white to blue and messed around with the colors until I got it to where I liked it. She's obviously supposed to be a Liara type from ME and I always liked the blue tinged skin.
For Keva I used the Astrid Elf skin from the Astrid character,
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It's for G3, but g3 skins work with g8. Don't think I did too much editing on that one as it was pretty good out of the box.
GL.