We have been directed to keep our students walking quietly through out the halls in order to help maintain the rigor to rigor style of instruction our district is wanting. A Parent in 5th grade came up with a nice idea for a silent sector, but I liked using a Twilight Zone theme with my 2nd graders and also for the 3rd graders also in our hall.
Before we enter the hallway, we "transform" by singing a few notes of the famous Twilight Zone theme song and it really makes a difference for my kids.
I have made two of these into half poster size pages and hung them from the ceiling throughout the hallway. Our halls are now more quiet than they have been in a while!