does anyone know how to create own tile in the Metro UI? I do not mean a program shortcut but the coloured blocks like the Xbox one ?

If you have the Microsoft Visual Studio 11 Express Beta for Windows 8 Manifest Editor and know how to use it you can create your own tiles for win 8. there is a web page explaining how to do this at msdn.microsoft.com/en-us/library/windows/apps/hh465437.aspx...
good luck

Instructions

1. Create a new project.

Open Visual Studio 11 Express Beta for Windows 8.
Click New Project...
Click Installed in the panel to the left of the New Project window, if it is not already open.
Choose the project language.
Choose Windows Metro style.
From the center pane in the New Project window, choose Blank Application.
Give your project a name at the bottom of the window.
Click OK.

2. Open the Manifest Editor

If the Solution Explorer is not shown, choose it from the View menu.
Double-click package.appxmanifest. This opens the Manifest Editor window.

3. Supply the tile details

Select the Application UI pane of the Manifest Editor if it is not already open.
Replace the default images with paths to your own logo images.
Choose whether to show the app's short name on the tile. This name should be 13 characters or less. If the name is too long, it will be truncated. You can elect to show the logo, the name, or neither.
Choose whether the name's text should use a light or dark font, based on the background color.
Either accept the default background color or provide your own as a W3DC color string (for example, "#FFFFFF"). This background color is used to colorize other aspects of your app: the button color in any app-owned dialog boxes and the App Description page in the Windows Store.