The school that my nieces and nephews attend do a Trunk or Treat right before Halloween each year. I didn't get many pictures. (Bad!)
About 15 cars were decorated (their trunks were decorated) and they give out Halloween candy to all the kids. There were probably about 100 kids that participated and the cars are parked in a semi-circle and the kids go to each trunk to collect candy! It really was fun and the costumes were great!