No-Sew Halloween Spiderweb Cape TUTORIAL ~ child or adult. Says: It's versatile too. I've made it into a witch accessory, but you could totally just be a spider web for Halloween and put a huge plastic spider on your back. MY COSTUME THIS YEAR!
This could be something like what Charlotte looks like after half turning, pale as the life drains away, and darkening from the eyes but not completely, and bleeding. She obviously learns to control her looks as she gets back to school, but yeah.