Europa Clipper
ESA proposal for a mission to Jupiters moon Europa.
On the left is TALISE (Titan Lake In-situ Sampling Propelled Explorer), the ESA proposal. This would have it's own propulsion, in the form of paddlewheels.
Read more at:
http://en.wikipedia.org/wiki/Titan_Mare_Explorer
http://www.space.com/17829-titan-lakes-boat-talise-mission.html
Image appeared in Issue 23 of magazine "All About Space".