If you want to add a personal touch to the standard white text-boxes which display all the messages during the game, you can create a border using the GUI Editor. Right-click the "GUIs" node, and choose "New Text Window GUI".

The element will be resized to about 1/4 of the screen, and you will see 8 pictures - one in each corner and one on each side. These are the border graphics. You change the graphic for a corner in the normal way.

In the game, the corner graphics will be placed in the respective corners of the text window, and the side graphics will be repeated along the edge of the window. To tell the game to use your custom text window style, go to the General Settings pane, and check the "Text windows use GUI" box. Then, enter the number of the GUI which you used.

You can also set a background picture for the text window. In the GUI editor, simply set a background picture for the GUI element. The graphic you specify will not be tiled or stretched in the game; however, it will be clipped to fit the window. You should use a graphic of at least about 250x80 pixels to make sure that it fills up the whole window.

To set the text colour in the window, simply set the Foreground Colour of the GUI and that will be used to print the message text in.