Some classics, musical pie-pass a pie around in a circle till the music stops whoever is holding the pie when the music stops gets pied, keep going till you have a winner, could add an extra mess for one losing person chosen by the winner.
Red pie Green pie- two teams of at least 6 each with 2 refs, teams are set a distance apart, green light- A team players move forward trying to make it to the goal where the B team is waiting IF a player from A team is caught moving after the RED light is called they get pied and are out. IF a player from A team makes it to the goal then the player from B team gets pied. roles are switched after all of team A either makes it to the goal or is pied and out. Whichever team has the most players that make it to the goal will be your winner, the losing team takes a messy punishment.
In rock, paper, scissors, PIE team edition, two teams square off with a player from each team going head to head in a round-based version of Rock, paper, scissors, loser of each round gets pied. Could do an elimination or just make it go till everyone has gone. The team with the most wins gets to give the losing team a messy punishment. tie is clean folks squaring off till a winning team is decided.
Simple slime elimination, 6-8 players recommended, players take seats, each seat gets a numbered bucket of slime, and after a bunch of switching the player sitting in each seat will call a number not knowing WHO is about to be slimed. keep going till you have a bunch of slimed players and one clean winner. It is important to note that the players in the seats NEED to see which numbers have been called and which ones are available. Could use simple gunge powder of different colors or colored cake batter.
Line up 3-4 of your older models, kneeling. Give them each a pie or tow, or a gunging, and they stay kneeling. Take one of your youngest models, have her put chocolate sauce down her ass crack. Then one-by-one, go down the line having her turn the kneeling models into human ass-wipes, smushing thei faces between her crack. Replenish the chocolate sauce between models for full effect. The "young girl domming the older women" in the most degrading manner.