I'm not a fan of elaborate hallway decorations since they don't really benefit my students much. I don't like putting their most prized work in the hallway, I prefer it in the classroom on our "I Can" wall. But, if I don't have anything in the hall I look like a real Debbie Downer, Sorry Sally, Negative Nancy, or Boring Betty. I have a large space because I'm near the boy's restroom so I have 2 display areas.
One on side I have our AR board. It's an Angry Bird theme that I LOVE. I bought the sky paper at Hobby Lobby and cut it in half width wise so I could laminate it (actually a wonderful volunteer did the cutting and gluing). I put up a picture of the different Angry Birds on the active board, and put out construction paper and said "Make a bird". They were completely on their own, no pattern, no "help" from me...and they are awesome!
Because the paper is laminated, the kids just use scotch tape to move their bird. The board runs itself and I love that. Also, since we are required to do AR, I differentiate by not posting the point total, but the percent of the goal that is reached. My strong, avid readers have a higher point goal. My readers who read low point books (most .5 for each book), have a lower goal, but everyone is capable of reaching 100%.
On the other side is my student work display. I got a Donor's Choose grant a couple of years ago and purchased the art frames from Lakeshore. Money well spent! They have held up very well, look great, and are the easiest, quickest way to hang papers.