erasers - we "erased" a word in the song. We sang "follow the prophet" and were silent whenever we were supposed to sing "prophet"
glue sticks - we glued first our legs together, and then our arms to our sides, so that we had to hold really still while we sang "come follow me"
crayons - the children only sang when I held up the color they were wearing. I put three different colors on each card and held up the cards as we sang "He sent his son"
ruler - we measured how well the children sang. They were given a grade for their reverence while singing, how beautifully they sang, and how well they said the words while we sang "Beautiful Savior"
calculator - we counted how many times we said the word "faith" while singing the song "Faith"
magnifying glass - they watched me closely and copied me perfectly while we sang "I belong to the church of Jesus Christ", so if I put my hand on my head or lifted my leg, they followed
pencil - we "wrote" our own songs, singing "fun to do", or "if you're happy and you know it"
scissors - I "cut out" the kids who were too wiggly while singing "The Holy Ghost". I tapped them on the head if I saw them move and then they would sit down
sharpener - we "sharpened" our song by clearly enunciating each word for "I know my Savior loves me"
Between each song the kids slouched in their chairs and I rang the bell and called up another child to pick an item. The kids had a lot of fun with it the first week, and we only got through 3 items, so I can still use it for 1 or 2 more weeks.
(added - Today I threw some tape into the backpack also and told the kids that I had taped their mouth shut and they had to just hum the song. Fortunately, they weren't too silly with it.)