My favourite costume was a toothbrush. I cut foamy strips out of green and white packing stuff and glued it to a hoodie. I went to a house of postmen and they assumed I was a mailbox and gave me extra candy.
Most years I just go as some form of a zombie/skeleton/demon thing. Warning on the creepy picture attached!
In swap news I started one thing, thought of something better, and got part of the new thing finished. Now I need to work on the other parts. And maybe finish the first idea, cause what the heck.