Komari Vosa/Asajj Ventress' lightsabers
 

Or paired Lightsabers really.

http://starwars.wikia.com/wiki/Paired_lightsabers


http://starwars.wikia.com/wiki/Asajj...27_lightsabers


I'm not sure how hard this owuld be to do bt the way I see it is that equipping the double balded combind version which would be the default would automatically equip two matching single bladed sabers to the alternative weapons slots. again I can understand if this is not doable the scripting seems a bit complex just thought i'd put it out there. the trickiest part would be upgrades, crystals and such.