Lustria for headings and Lato for content is an elegant combination to experiment with in your design.
Roboto Slab for headings and Roboto for content can be an effective combination in the right design.
Raleway for headings and Merriweather for content gives an old fashioned look in a quaint design.
Quattrocento for your headings and Quattrocento Sans for content. Try it in your web design.