How can I change the color of the DOS screen?

I am bored of the black color, how can I change it?

It's rather easy. You can configure the DOS window and change some of the things around. Color for one is easy to change.

Open a DOS Window from Start | Run

Right click the top of  DOS window inside the title bar. From the drop-down click on Defaults. This opens the following window.

Now click on the Colors tab in the above window. I have changed both the Screen Background as well as the Screen Text. You can immediately see the changes you are making.

The next time you open the DOS window you will see the changes provided you clicked OK to the above screen after the changes.