CHANGE THE COLOUR PALETTE OF WINDOWS

Want to give your Windows XP desktop a new look? Right click the desktop, select Properties and click the Appearance tab. Assuming you like the Windows XP look and feel (buttons, scrollbars, and so on), leave Windows XP selected under Windows and Buttons. Then click the down arrow under Color Scheme and choose a new color palette. Once you've made your selection, click OK to keep the change.
At the time of this writing, using Windows XP RC1, the only choices available other than the default blue were olive green and silver. Maybe they plan to add more?