Trunk or Treat - Creative Minds Wanted

We've decided we're doing a 'Trunk or Treat' for the 31st at our church, where we dress up our cars (and ourselves) and hand out candy from our trunks in the parking lot, so it'll be like going to a neighborhood of houses except it's car to car instead of house to house.

I'm going to dress up in all my bellydance fluff and jingles, but I'm somewhat at a loss as to how to dress up my station wagon. I don't want to spend a bunch of money on it, but all I can think of are uninspired things like tacking crepe paper around inside the windows and leaning a couple corn-shocks on it. :-/

It's a big old Ford wagon with wood paneling and pop up seats in the back.

Help me F-list, you're my only hope!