I didn't grow up in the church, but my siblings did. For some reason I never got involved in the roadshows when they did. (Knowing what I know now, I'm sure the ward would've gladly welcomed me to participate.) I finally got to be part of a roadshow when I lived in Salt Lake City, after graduating from BYU. I don't remember if I was actually 'in' the show, but I did draw and paint (with help) some of the scenery.
I drew out the designs on paper and then traced them with a Sharpie on some plastic that I had scrounged up and cut into small sheets. Someone built some big lightweight wooden frames and we stapled butcher paper to them. I used my newly acquired teacher skills to project and trace the drawings onto the framed butcher paper.
My favorite drawing was The Battle of the Champs. I thought it was a pretty clever interpretation of the rivalry between the Brigham Young University Cougars and the University of Utah Utes.
I was also proud of creating the illusion of a crowd in the stadium picture without drawing a gazillion little heads, but was quite disappointed when someone sneakily added in the 'Coke' ad and threw the whole drawing off center.