You can have your name added, for free, to a microchip that will be mounted on NASA's InSight Mars lander, scheduled to launch in March of next year, and landing on Mars some six months later after.
The lander, under construction:
Insight is designed to study Mar;'s interior, mostly by seismic analysis.The mission and lander are described here: http://insight.jpl.nasa.gov/home.cfm
When you sign up to have your name added to the lander, you also get a mock "boarding pass," thus:
Over 360,000 people have already signed up.
It's all for goodwill and PR, of course.
But it's also for posterity: the lander, and its chip with your name, will be there likely for millions of years --- far longer than any similar device on Earth's surface.
To show your support for NASA --- and to grab your small bit of long-term interplanetary glory --- sign up here (http://mars.nasa.gov/participate/send-your-name/insight/). It's free!