I did this just cause I had the parts so I decided to just slap it together.
For the Dice gauntlets, I just scraped off the markings from Snake Eyes' armor. Since he uses Rex's head which is scarred, the story is that he kept the scratches in the armor to remind him of why he's so bitter instead of keeping his armor clean. The Red Fang Ninja gear has purple parts on it and that's the homage to the purple figure Hasbro gave us.
For Slice, it's just the black Storm Shadow head on a Red Ninja body.