In windows 8 provides multiple themes in windows operating system. Theme is combination of pictures, colours and sounds. You can sets your theme according to your choice for example set desktop background , set pictures in your desktop background, change colours of windows.

Basically four options have to change your theme

To change theme of your operating system follow below steps-:

1.     Open Control Panel

2.   Select Appearance and Personalization. 

3.   Click in Personalization option

4. Now choose your theme which you want to apply. Set which you want to change

background, colours, pictures and screen save and click Save Changes button

For reuse your theme save this theme.

You can also download theme online to click Get more themes online.