I suppose a meqleH (short sword) is always appropriate. Of course, if you buy off the gift register, you spend eternity in Gre’Thor. (Thank you Klingon to English dictionary site).
Of course, these two charmers do not need the make-up for a true Klingon event. They were arrested at a wedding reception after a brawl in which one hit the other with a PVC pipe and tire tool. Who brings a PVC pipe to a wedding? These guys, apparently.