Some of the Nexus S users are happy with the Google experience but feel dull with the new color schemes after updating to the latest Android OS 2.3.3 (Gingerbread). There were complaints regarding this colorful issue. Google said that the colors reflect any changes to the color temperature settings. The Gingerbread UI tends to get darker with lower brightness levels and was not working properly.
Ry Guy who is a Google employee posted a message in the Google Mobile Help Forum:
"With your new OTA complete, you may notice a slight difference in the way colors are displayed on your Nexus S. For Nexus S, we have adjusted the color temperature settings to more accurately reflect darker colors at all brightness levels. The Gingerbread UI being darker, we found that the colors were not as accurate when the device was being used at lower brightness levels. For example, some users reported that the initial color temperature was too high leading to some darker greys having a reddish tone; with the new color temperature this is no longer the case."
With this message, it is clear that Google is listening to the community and dealing with issues. There were issues bought up by users with low brightness levels affecting the color display. The color temperature seems a bit tricky and may not be easy to fix by end users. In response to the thread, users seem to mention that more adjustments are required to the settings.
This video shows the display difference between 2.3.2 and the 2.3.3 update.