This Is War features thousands of different album covers, as friends, fans, musicians, artists and many other notable persons submitted their own photos to be used on individual covers as part of the band's innovative Faces of Mars campaign. Not only are fans on album covers, the Thirty Seconds To Mars faithful can be heard yelling, clapping, stomping and singing choruses throughout the album. Fans participated in these "Summits" earlier this year in any of 9 countries around the world before the band extended the event digitally through TwitVid, allowing any fan with a wireless signal the ability to contribute.

"The Summit started as an interactive recording experiment and quickly became a defining element to this album," said frontman Jared Leto. "An extension to this interactive idea is The Faces of Mars campaign. Basically an art project that celebrates the physical release of the cd and gave us a chance to put a face to the thousands and thousands of voices from around the world."