-Final Fantasy VII themed weapons (You know, because Gold Saucer is from FFVII). A few examples would be Premium Heart for MNK, Princess Staff for WHM, Vincents Death Penalty for MCH, maybe a Red XIII inspired Astrologian Globe, Cid's Venus Gospel for DRG. I'd say Buster Sword for DRK, but we all know that's reserved for the FFVII remake launch event that will inevitably happen.
-An Omnislash level three limit break replacement for Melee DPS ( You know, because Gold Saucer is where you got it during FFVII). You could even make it a toggle effect that persists through death so you can turn it on and off at will. It would do no additional damage, just purely cosmetic.
-FFVII themed clothing: Tifa for females, and Barret for males.
Honestly, it just feels like there's a severe lack of FFVII related prizes from the FFVII theme park and casino.
Aside from the FFVII stuff,
-Two new gender exclusive hairstyles, specifically the second place winners from the hairstyle contest.