Mario style gui!

How can i change the gui text to look like the super mario GUI text, that is textured and coloured?

With a gui text object, you'll want to change the "Font" and "Material" by dropping new fonts into your project and dragging them into the fields. You can make a material that uses the "GUI/Text Shader" shader and change the text color manually on it. With scripting, you'll want to set up either a guiStyle or guiSkin to handle this dynamically.