I am going as Ginny Weasley this year (from Harry Potter)
There are lots of cute little somethings you can put together…one year my Fiancee went as Corporate Pirate, just dressed up in a business suit, with a bandana and eyepatch.
One year he went as The Dark Load. We made him a “Staff of Softness” (a dowel wrapped in old black T’s and screwed a Downy Ball on top, for a staff) and I Ironed on the NO BLEACH symbol on an old Gray shirt. We then attached a bunch of black and dark load kinda stuff to him (like socks) and gave him a dark blue towl as a cape…it was funny…
Then there are all the ones we all just talked about…like dressing in blue and attaching cottonballs to yourself and walk around with a spray bottle…you would be “Cloudy with showers”
There is always the “Hello my name is GOD” sticker, which requires nothing in prep…
I read somewhere about someone who just took a ball of yarn, wrapped it around herself and stuck two needles in her hair and called herself a ball of yarn…
There are a lot of little cute things you can pull together cheaply…most of them play on words…