Templates should be simple, clean and easy to understand. They can come in a myriad of different formats, styles and cover a multitude of various models. As a template designer, the key is to try and make the template itself disappear into the background, while at the same time coaxing the actual information it contains into the foreground.
So no crazy fonts,
and no crazy colours.
You will give your users a headache, especially if they have to stare at it for a long time.