How to make paper dogwood flowers - great spring project for classroom. Could plant a bare branch in plaster-of-Paris in a small bucket and have the class decorate it. Make a bird's nest and put in the top branch to go along with unit on Spring.
Herbs in frozen olive oil is one of my favorite ways to harvest. The herbs don't get dry, brown and brittle in the same way they do when they're frozen in water. They also retain their scent and flavor much more effectively!