... Chapter 17. Hacking Mac OS X Section 4.5.1 shows you how to customize your desktop picture, error beep, and screen saver. But if you're sneaky, creative, or ... all are perfectly safe. 17. 1. TinkerTool: Customization 101 If you poke around the Mac OS X Web sites and news groups long enough, you'll find little bits of Unix code being passed around. ... your own. All you need is a few of Mac OS X& apos;s less obvious tools, or some free downloadable customizing software, and a few recipes like the ones in this chapter. Some of these tricks are...