Windows Phone offers at least 10 colors so you can use them as accent color. Here is how to switch between the two.
To change the Colour Style:
1.-In Start, click the arrow () to go to the Applications list, then click Settings.
2.-Click Theme.
3.-Click the Color list of emphasis.
4.-Click the color you want to use, then wait a few seconds or press the Back button. The new color theme will appear in the phrase highlighted.
To change the background theme
1.-In Start, click the arrow to go to the Applications list, and then click Settings.
2.-Click Theme.
3.-Click on the Background list.
4.-Select one of the following options:
To make the background black, press Darkness.
To make the background white, press Clear.