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They could do it like the custom controller colour creator except more detail
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A 3D model of a Spartan that you can rotate, drag and place colours on and draw on and use a combination of decal shapes in order to add things such as a white outline on a piece of red armour for example
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The Forza Horizon 5 vehicle editor is a good example. You could then make an entry and people can vote for the top 3 or 10 coatings