This blog is all about making your day that "little bit lighter", so I found this glorious website that needs no input from you whatsoever...!
Simply load this up on the whiteboard while students are doing their tasks and immediately the balls will respond to the noise in the room! If it's lovely and quiet, the balls calmly twitch at the bottom of the screen, but once noise happens, well they start bouncing!
Keep your class encouraged to keep the noise down, by allowing them to see for themselves how they are doing and reward accordingly!
You can get this awesome resource HERE!
For more ideas: