I want the one Jedi Master Ven Zallow dropped when he took Malgus's blade to the tum-tum.
I would carry it on my belt and use it for all kinds of cutting, melting and slashing. I would definitely reverse engineer it to made my own sabers and eventually use them for fighting anyone who got in my way, namely you jedi out there who also have them or anyone dumb enough to try and rob me.
Plus, they would make a very convenient lighter for candles & such.