Reader Edwin wants to know how to change the themes in Windows 7. Specifically, he has multiple photos he wants to use for his desktop background, but can’t find a way to add more than one.

I get bored with my desktop wallpaper pretty easily, especially in Ubuntu Linux, where it's nearly the only thing on my desktop. Until recently, that meant scouring theming sites for great artwork ...

Relatively simple ways to remove Windows 7's floating-color-balls start-screen animation, and supply your own background images for the operating system's log-on screen and desktop.