You have tested Windows 7, you liked the way it looked, but decided to go back to XP. Or you didn't have the opportunity to test Windows 7, but you know how it looks. And now you want to customize Windows XP so that it resembles the new one as much as possible “toy” a where Microsoft.
For those who want to change classic theme of XP with a similar Windows 7, I can go here. But in case you want to use other themes for XP, but miss a few characteristicand of Windows 7, then it is good to know that borrowing some aspects of 7 (such as login screenhis taskbar-ul) by XP is possible.
1. Download Win7 login screen for XP.

Extract LogonUI.exe from the archive, and replace it with the file logonui.exe FROM %windir%System32. After the restart, the PC will tell you Welcome in the style of Windows 7. :)
2. The unusual design but also functionality taskbar in Windows 7 caught the attention of many XP users. Using the following Applications, you can customize the taskbar of your system so that it resembles the one in Windows 7.
Download Taskbar Shuffle (the application allows changing the position of the taskbar buttons).

Succes! ;)