Change Template Colours on Joomla Template (Inc Design)

Hello, Very simple project, i have a Joomla Template which i need copied on the same website. The copy then needs to have the colours changed to match the new business logo. So the job is: - Copy Template so the original remains intact - Create design to create existing colours to new colours found on new logo (will supply) - Upload new template. If the job is done and i am happy with it, i have another website to do the exact same thing too.