Here are some examples from my class this year:
Each week I cut the journal strips that we are going to use and store them in this coupon/bill organizer one of my wonderful teammates discovered in the Dollar Spot at Target! (We also picked up the smaller size that is perfect for word cards.)
The kids love journals; they actually cheered yesterday when I said take out your math journals!
Do you use math journals? How do they work in your class?