My teacher uses a Noise Meter similar to this one. The Noise Meter is a cool way to remind students the correct noise level that they should be using! You just use the paper clip and move it to the appropriate noise level the students should be using.
Try Wall Pop dry erase stickers on a table in your classroom! I use it for spelling work, small group instruction, and math time. They add a pop of color, too! I love this idea for my kiddie table for small groups!