I agree, money doesn't mean much at that age. Also, money doesn't always mean much at ANY age! Every child has their "thing" and it's not always money. For example, my 12-year old lost her library book. I figured the best consequence was for her to pay for the lost book. We went to the library, she paid for the book and then promptly lost the next library book! She didn't seem to care! So I made her volunteer at the library for 2 hours. THAT made an impression as they made her sort books and help in the children's library. Once she saw how hard they work at the library, she was careful about keeping track of her books.
I would do what other posters suggested and make an obstacle course so the kids can't run down the hallway. Cones or even an obstacle course of stuffed animals might help! The kids can set it up themselves--it'll give them something fun to do and remind them to "tiptoe through the jungle."
I'm still old-fashioned when it comes to the walk-don't-run rule. If you run, then you have to walk all the way back to the beginning and then WALK back through the area. It's a simple way to remind them. Running won't get you there faster, it's SLOWER because you have to walk back and then walk again.
When my D was younger, she was loud in the morning when her father was trying to sleep. He was up late and needed to sleep in the morning. I did a simple green/red reminder. We had a circle that had green on the one side and red on the other hanging from a string. I taped the string to the mirror. When the red side was out, that meant she had to be quiet. I put the same reminder up in the areas she was in the morning--the kitchen, bathroom and living room. All I had to do was point to the red and she'd quiet down. Eventually she learned, although the funny thing was she didn't quite know how to whisper yet so she'd go to whisper something in my ear and end up being very loud!
The only other thing I can suggest is the marble jar rather than money. They get marbles in their jar for following the rules and they get marbles taken away for disobeying. Marbles can be cashed in for things like extra TV time, etc. It's a good way to teach about "money" without actually using money, and it's in a way they understand.
Good luck!