Cut out about 15- 20 3" x 5" images (index card size). Look for images that have plenty of space to draw on plus light colors. The images above I picked out for my son's doodle pad.
Cut out a 3"x 10" piece of paper, fold in half. Place all pieces of paper inside the cover, Staple at top or side of your doodle book.
The cover above actually came from a craft store advertisement.