The past 2 years I purchased spiral notebooks for each student (during the BTS sales).
We keep them in our desk for one of those "moments".
They are fairly simple and random. Somedays we write our spelling and highlight the rule for the week, or list 5 facts from the story we read and do a quick write. Yesterday we wrote out a few fact families during a quick math moment. During language time we did this page above as a review. We don't have many rules for our spiral notebook... just be sure the date each entry. It has been nice to refer back to one quick, easy-to-get resource for reviews and questions.