Here are a few samples:
Green Man (or Environmentally Aware Guy)
Other ideas are:
Kate Gosseline--there's bound to be plenty of wigs available for this one.
Chesley “Sully” Sullenberger the pilot safely landed in the Hudson River after flying into a flock of geese. You'll need a dark suit coat, a set of pilot wings, a pilot's hat, and feathers.
That's all I've got for now, but as always I'm looking forward to seeing what creative creatures come out for Halloween.