We are a very small ward but big in spirit!  To keep reverent children I bought a glass Jar from the dollar store and made a pretty label in the computer and called Reverence Jar. Beside the jar I displayed a colorful poster listing all our Primary's rules such as:
 

* Keep your hands to yourself

* Whisper

* Be kind to each other etc.. etc
 

Every Sunday I remind the children that if they are reverent and follow the rules they all get to put a marble and when the jar fills up we are going to have an ice cream party. So each Sunday at the end of sharing time I ask the children if they think they deserve to put their marble in the reverence jar...  One by one I call them and I say "______ thank for being to reverent in Primary today".

They been so reverent. They been just so excited to see how their jar is filling up. This has been a  wonderful way to keep reverence in our primary!