Style XP is a theming software that helps customize the way your Windows XP, Windows XP Service Pack 2, Tablet PC or Server 2003 system looks by downloading and installing XP themes.
It uses Microsoft's built-in visual style engine, but enhances it by providing many useful tools. Style XP can import, select, rotate, and manage themes, visual styles, wallpapers, logons, boot screens, icons, and explorer bar. If you are running a 2048x1536 display resolution, the display can exceed 100 DPI. StyleBuilder is designed to build skins which support the higher DPI resolutions so that window controls are easier to see. There are a lot of enhancements you can apply to your XP look such as: 5 levels of transparency, boot timeout editor, icon shell size between 16 - 128 pixels and many more.
Pluses: Once installed, StyleXP doesn't require a system reboot nor uses a huge amount of the system's resources, which means that you can run plenty of applications without fearing a system crash. Style XP comes with multi language options.
Drawbacks / flaws:
In conclusion: StyleXP appears to be a good choice customizing Windows for its clean and un-cluttered interface and support for XP core-wise which hardly can create any modding related problems. Also it has a lot of themes to choose from and all themes look cool, non-pixilated and are refreshing to use and easy-on-eye.