Rice Krispie Temples - Could so be used as a combined YM/YW activity. The Bishopric could come in at the end and pick a winning group/class. -- Could have several different Temple pics around the room so they can gain inspiration!
Mission: Impossible | The floor is lava, and players use random items to cross the gym. Come up with a variety of races, such as teams, pairs, boys vs. girls, etc. Great for LDS Young Women and Young Men activities.
Young women cupcake wars mutual activity- each team had station with pictured ingredients and were able to pick two mystery ingredients from a table of many options to make the most creative "divine nature" inspired cupcake. They were judged based on three criteria- taste, presentation, creativity. The winning cupcake had a temple on top sculpted out of banana!