Maybe for Charlote's Web (?) Water color crayon resist artwork, an Original watercolour painting by Kirsten Bailey, but could be adapted for a children's art activity. Great for a fall wall hanging or spider picture for the fridge!
Painting with watercolor and salt. Wet paper, paint with bright watercolors, then sprinkle with salt and wait to dry. When dry, brush off salt and you have an instant masterpiece. Cut it up for bookmarks or frame.