To help users with choices of color schemes, we have enabled all four of the color choices available in the current theme. These include the default Day as well as Dawn, Dusk and Night.
You may select them in your own user profile by going to the user drop down menu in the top right corner and clicking the down arrow and selecting Profile.
Click the Actions button and then click Edit.
Tabs will show up below this and click on Layout Options.
Choose the Style and then click Save.
These are the styles available: