- You can reimagine the colors for anything: characters, clothes, accessories, landscapes, planets, technics, transformations, alien species, divine beings... Anything goes!
- You are strictly limited to changing colors, but you have no set limit in doing so: you are free to totally disregard any colors that had been chosen so far, along with any statement about colors, whether in-universe (such as the mention of a golden-haired warrior, or pure-blooded Saiyans being black-haired) or out-of-universe (such as Toriyama wanting Goku's costume to be reminiscent of the orange worn by Buddhist monks).
- Only little changes or complete makeover, you're free to decide: maybe you'd like to change only Goku's blue under-shirt and keep the rest absolutely untouched, or you might want to go crazy and keep absolutely nothing from his original colors and even change his natural hair color!
You're the boss, you can go for little touches if you think it's enough of an update, or go for a complete, "ruthless" reinvention.
- Justifications or not, it's up to you: you can choose colors based on very specific concepts, references and logical explanations, but you can also just choose them just because you think "it would look cool/interesting" and that's it.
- It doesn't have to be good ideas that you would choose: you can propose things that would be a concept that comes to your mind, but that you wouldn't actually like or apply.
So, any ideas about new colors that would surprise even long-time fans?
Examples:
"Giant Ape" Super Saiyan 4: the fur and eyes do keep in line with the Giant Ape it's based on.
"Dragon Within" Dragon Ball: just a crystal ball, but the stars inside are colored after the green dragon that's within.
"Alien once more" Namek: people have gotten used to Namek over the years, the blue vegetation and green sky feel almost usual and comfortable, not strange anymore. Why not throw unusual colors to make it feel strange and otherworldly again?