I usually don’t do the whole Halloween “thing”. Ok, I never do. But this year I am in a relationship, and thought it might be fun! I don’t want to break the bank on our costumes, and ultimatly would like to make them. I was thinking along the lines of a couples theme, but something out of the ordinary. I knew that this was the place for some suggestions 
Years ago, in West Hollywood (of course) on Halloween, there were two guys who went as lamps.
They somehow rigged real light bulbs, with ornate lampshades, on their heads (battery pack was on their back) and it was quite amazing. Still not quite sure what they were using as batteries, but they were certainly a fun (and bright) couple on the street. BTW, they didn’t have any other feature for their costumes - just regular street clothes, but with those amazingly, well-lit lamps on their heads.
I did the Mario and Princess Peach thing once.
Also, for cheap, we we went as an old married couple, wearing bathrobes, curlers, slippers, etc. and bickering all night.
Once, I did vampiress and he went as my blood bank.
Shark and shark victim.
The victim should have a gaudy pink “Welcome to Daytona Beach!” or similar shirt, ripped into shreds; a broken pair of swim gogles/scuba mask; blood and scars & whatnot; etc.
The “shark” should dress as a… shark.
Pretty sure I’ve suggested this before; got someone on one of my e-mail lists to use it and they sent me a picture. It was hilarious!
One of you wears all white and a stainless steel colander on your head. The other wears a copper/orange-colored shirt and black pants, with “DURACELL” painted/written in block letters down the side.
You’re assault and battery.
My parents told the story of winning a costume contest by going as “Mr. & Mrs. Outhouse.” It sounds like it was a pretty simple costume – big cardboard boxes, cut a crescent moon into the door to see through. These days you can add the “men” and “women” symbols.
Last year me and GF went as Sexy Red Riding Hood (her) and Snow White’s Evil Queen (me). I got checked out more than she did
By drunk dudes 
Are you a girl or a guy? Not quite sure how to take this post without that information.
I am a guy. It made the ‘evil queen’ costume even more appropriate.
I have friends who borrowed a canoe paddle and hip waders. She was “Row” and he was “Wade.”
Pepper Mill and I went as Medusa and Perseus one year.
Another time we went as Pepe le Pew and the Cat With The White Stripe Down Her Back. (Pepper made the costumes herself – a really big job.)
Another time we went as Frankenstein and Bride of Frankenstein.
If you’re looking for risque, a couple of our friends went as a guy dressed in bib overalls, a white work cap and a trowel. She was dressed in a cardboard box painted red. She wore a sign labeled
BRICK, and he wore a sign labeled BRICKLAYER.
For some reason, I thought this was going to be a menstrual joke, like she was a red box and he was a tampon. (Read too fast and thought the overalls were white too. Not sure what the trowel would be for, and I don’t think I want to know.) I suppose you could do something along those lines . . .
I used to know a couple that went as Frankenstein’s monster and the sea witch from The Little Mermaid. The couple’s names? Frank and Ursula.
By far the best I ever heard of was a married couple and their infant son. I can’t remember what the wife went as. The husband dressed up as the grim reaper and carried a Fuller Brush case. The son was in a kitten costume and crawled around on a big sheet of cardboard covered in foil. Their overall costume was called “Triple Play.” (Death of a Salesman, Cat on a Hot Tin Roof, and ?)
One in a hat with a buckle and black hose, the other in a hooded robe with a sickle.
The Pilgrim Reaper
Get a cap and a red and white striped shirt with some glasses. Give her a red overcoat and a red fedora. (Where’s Waldo and Where in the World is Carmen Sandiego)
Come as the two bearded leads from ZZ Top. That’d be so cool with fake (say poster board over cardboard) guitars!
This works best if you have an Indian (i.e. asian) accent.
Tell everyone you and your friend will turn up dressed as “Moods and Feelings”.
You need to arrive with your todger hanging out and dangling in a bowl of egg-based dessert, while your friend should have his John Thomas shoved firmly into a *Pyrus communis * and a look of satisfaction on his face.
When asked which Feelings or Moods your costumes represent you can then say (in your indian accent):
“I am fucking dis custard, and my friend has come in dis pear”.
That’s awful. Oh, the pain…
I’ve always wanted to go as Bono and the Edge, but my wife won’t go for it.
I went one year as a pimp and my ex as a ho.
Oh, the irony.