Windows 7 had one of the major changes in the form of Taskbar. Windows 7 taskbar comes with lots of new features like jumplists, thumbnails etc. Here is a simple app which can add textures to your Windows 7 taskbar. Texturized Taskbar is a simple free application which texturize your Windows 7 taskbar with predefined color schemes. The application comes with more than 10 themes in build.
This currently only work if your taskbar is set to the bottom. It should work fine with Windows 7, Vista and XP.