See the glass tower to the left of the escalators? That's where our accounting department's lunchroom was located. I always thought it looked a lot like a gilded birdcage.
So..., one year I dressed up as a gilded bird. Purchased lots of cheap but colorful feather boas, tore them apart and stapled them all over a black shirt, and made a feather mask with a huge beak. Wings were created out of stiff wire and some more feathers stapled to fabric. I then stood at the window flapping my wings at people below as they walked by.
Used to have pictures of the hilarious sight, but I seem to have lost them.
Another year I came as a tiger. I painted up my face to look just like tiger stripes and whiskers and wore animal print clothing with a long fluffy tail.
As a kid, I remember going to a school party as a vending machine. I painted up large cardboard boxes, cut holes in it for my head and arms and slots with knobs to dispense Halloween goodies to friends.