how to chang your theme & design(customising)...

When you design your profile page, everything you see on Twitter will be set in the theme you have chosen. Not only are you making yourself unique to those viewing your profile, you are creating a customized experience for yourself on Twitter.

To customize your design:

                                            figure-1

1. Log in to www.twitter.com
2. In the top navigation bar, click Settings (or go to http://twitter.com/account/settings)
3. Click the tab labeled Design
4. Select a template by clicking on it, or upload your own background image by clicking "Change background image." and select tile (if u want to tile the background design) (see:figure 1& 2)
5. Save your changes when done
6. If you want to customize the sidebar and font colors of your page, click "Change design colors"
7. Click any of the boxes to change your colors; click Done when you're finished. (figure 3)

                                                     figure-2
 

                                                    figure-3

 Note: Background images must be in PNG, GIF, or JPG format, smaller than   800k.Animated GIFs are not supported as background images.