Sure you want to be different with other people's twitter. Therefore, do not use the setting provided. To personalize, use of personal images.

To change the twitter account profile, users are welcome to click the Devices menu, then click the tab design.

Still on the same page at the bottom, click the Change Background Image, then the additional option will appear. Here, live click Choose File.

Then, do not be surprised if you change your Twitter background as you wish.

You can see the difference. Amazingly, this personalization can be done many times. Use the appropriate picture resolution monitors. For example, if using a laptop, usually using a resolution of 1280x800. While the personal computer, use a resolution of 1024x768. The goal, so that your background images do not overlap, so only one image intact.
After changing a background image, you can change the color of your twitter account design, change text, links, sidebar, and the borderline. Way, can click on Change design at the next Change Colors Background Image.
Do not forget, after making changes, click Save Changes.