Adding additional weapons to rock-paper-scissors
Well, I think your need is probably satisfied by RPS-101: 101 gesture Rock-Paper-Scissors. There are apparently 5,050 possible outcomes to this game, which should keep you entertained for a while...

For something slightly less mindblowingly hardcore, the same author has also developed 7, 9, 11, 15 and 25 gesture variants. These get complicated quickly! As an example, the 15 gesture version looks like this: