When people click over to your Twitter account page, they get an eyeful. Your icon, your bio, your latest tweets—and your background. The cool thing is that you can customize your background in a number of ways, bringing some additional personality to your page.

If you do nothing, your page looks like the upper example here—which isn't bad. If you want to take it another step, you can change just the colors (background, sidebar, links and outlines), as you can see in the middle example. The lower example shows one of several nifty themes Twitter has created for your backgrounding pleasure.

You can take care of all the visual tweaks under Settings → Design.