Our clients is used to the lighter blue oceans that come with Google Earth tiles. It has been a challenge to get them to like the Bing tiles that have a much darker ocean. I tried playing with the brightness, gamma and other options in the sandcastle imagery adjustment demo. The only option that came close was the Bing tile with STK terrain when it has the day light on it. Would it be possible to adjust some configuration to get the day light look through out the globe?
Sorry, there isn’t an easy way to adjust the color of the imagery for just the water. The daylight effect is accomplished with a shader that is dependent on the sun position.
You could try a proof of concept by getting a small (8192 px) single image of the whole globe, and adding that as a single image tile with the bing layer.