Here are some craft ideas for your party...including the sucker idea I featured a few days ago. I have seen this TP idea before on Family Fun, but never thought to do it for a Halloween party. This would be a fun things for kids to make and then they would also have something fun to take home. You could ask for toilet paper donations ahead of time if you are planning for a large class/group of kids.
(Ideas from One Charming Party...head there for more details.)