Most of the case studies around A/B testing is very misleading. The value you get from testing color schemes is likely to be insignificant - unless you have a really horrible color scheme as one of the options or you have traffic comparable to Googles and Facebooks of the world.
That does not mean you shouldn't test. You definitely need to test and learn from your customers. There are other better ways of doing it, than just A/B testing as is often advocated.
A/B testing is overrated, imho. We have blogged about it here -> http://blog.nudgespot.com/2013/06/time-to-rethink-ab-testing.... Customers are lot more intelligent about their purchase decisions than what these blogs like us to believe.
That does not mean you shouldn't test. You definitely need to test and learn from your customers. There are other better ways of doing it, than just A/B testing as is often advocated.