SharePoint 2010 different Site Collection with different header color

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SharePoint

SharePoint2010

Hi everyone here,
I wanna know that how can we have different header color for different site collections like if I have created a site collection for ID 9080 having URL as http://localhost/9082/ and have top color assigned for it as blue, same i have another site collection for ID 9081 having URL as http://localhost/9081/ and have assigned green color for it's top header means that title bar. The problem is that I have created these two site collection programatically in c# and but how can I assigned or fixed the above 2 different colors for both those 2 different site collections. Any suggestions would be appreciated. Please bring me out of this nasty situation.