Get a "color" token type, that would enable the user to choose a color. The token value itself would be in hexa (#ffffff format) so that we could use it in assets.
Ideally the admin could restrict the list of colors to be used, though a palette.
I've considered using program tokens to manage colors within email and landing page templates. I use program tokens a lot in templates: forms, logos, heights, widths, etc. Color could be done as well.
Of course they can. In strings. So you cannot control the fact that they are entered correctly and you cannot limit the choice to colors accepted in you branding.
This idea it to avoid all these issues when a large number of users are involved.
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