By colour marker, do you mean labels? If so, this is not currently possible- the colors are limited to what you see, however you can reuse colors by giving them a different name.
You might also consider sending an email to 'firstname.lastname@example.org' to suggest they add additional label colors.
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A blank Trello board can be both a beautiful and intimidating thing. How many lists should I have? Is creating 10 labels overkill? How can I best track my progress? Is there a way...
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