CNN just launched a project called CNN Celebrates http://edition.cnn.com/SPECIALS/cnn-celebrates

They are going to celebrate a bunch of big events coming up this year and Halloween is first up! They are after photos and videos of the coolest, weirdest and spookiest Halloween costumes and decorations to showcase on CNN. They are using their user generated platform CNN iReport to do it so people can easily upload the best photos and videos they have taken: http://ireport.cnn.com/topics/856991

The best ones will be featured on CNN.com and some will be shown on TV as well.