Inspiration: The activity is inspired by an activity in this book http://www.amazon.com/Usborne-Book-Art-Ideas/dp/0746038291 which has a lot of great activities.
These swimming sea turtles were created by some grade 2s a couple of years ago. They began by drawing their turtle and colouring in oil pastels. We then scrunched up the drawings into a ball (you should've seen some of the faces when I told them they had to do that!) to create an interesting texture. Once sufficiently flattened out again, students painted on a blue dye wash which gave them a wax resist and THEN we sprinkled on salt and watched the amazing watery patterns it created in the background! A fun project for challenging students to experiment with different mediums and techniques.