Can I change the style of a table?

Yes it's possible to change the style of a table. You can pick one of the presets and or create your own style and save that as a template.

First of all you have to select your table.

Now choose from on of the templates in the Styles section of the Table Tools menu
If you want to customize a style the click the little triangle pointing down and click Custom Style

Now change the Header Row and Footer Row background

When your done you can save the style as a dwextable template and apply it to other tables using Load.