Hi CookyMonzta,
Thank you for posting your query in Microsoft Community Forums.
From the issue description I understand that you need to add more colors to the official Windows XP color scheme.
For Windows XP you can download the themes from the link below.
http://windows.microsoft.com/en-IN/windows/themes
To personalize Windows XP themes I would suggest you to use your favorite search engine to get required themes.
Disclaimer: Using Third Party Software, including hardware drivers can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the use of Third Party Software can be solved. Using Third Party Software is at your own risk.
Hope it helps.
Keep us posted if you face any issues on Windows in future. We will be glad to help you.