I hate that I ended up not making anything for this, but I have two I started that I might put out there anyway.
I have to say, if you end up not using the winning palette, I personally think that
"Ultraman Crisis on Two Earths by felideo"
"Darkest Night Black Lantern Superman by yunnin"
"Superboy Prime by felideo" and
"Superman Godfall 2 by felideo"
are all amazing, and would make especially good palettes. Just my 2 cents.