This is genius! Put class list in a frame to easily mark and erase. It would be cool to add a line at the top where you could write what you're checking off such as "Field Trip Money." that way you can easily keep track with a collection and the kids can see it, eliminating the constant questions!
Nature scavenger hunt.. Start with this then turn it into a writing/ art project--Describe the object, then have a friend draw the object you've described without knowing what it is! FUN! Good first week back activity?