Anyone have a good idea/theme for a Halloween costume for 4 adult couples?

Grease... T-Birds and Pink Ladies

You could go as a bathroom - toilet, sink and tub. The tub would be a 2-person costume - one for the shower part and one for the tub part. Another option might be to go as a table and chairs, a place-setting (2 forks, and knife and spoon). Outside of that, you could pick 4 characters from a TV show that would be easily recognizable. Maybe even 4 from various Saturday Night Live skits - the Land Shark, Rosanna Rosanna Danna, the "wild and crazy guys", coneheads or some of the newer characters.

1. I dream of Jeanie and Major Nelson

2. Cat and mouse with the mouse leading the cat by a leash

3. Cowboy and cowgirl

4. Gilligan and Mary Anne

One year I saw a big group like yours go as wizard of oz. It is immediately recognizable:

1. Wicked Witch of the West

2. Dorothy

3. Toto

4. Tin Woodsman

5. Scarecrow

6. Cowardly Lion

7. Yellow Brick road (dress all in yellow and paint on a brick pattern of lines)

8. Tornado (dress in grey and paste on farm animals, fences, farmhouses, twirl around a lot and make whooshing noices)

alternate options:

The Good Witch (Belinda?)

Munchkin

The Wizard

Flying Monkey

Gilligan's Island is a great idea!! The eighth person could be the wrecked boat!!

Midnight at the Oasis, Two Hareem Girls, and two very rich Sheiks. Take a Belly dance class or two and have some fun with a veil dance for your Men. I hope you have a great time, whatever you decide.

get another couple to join you, make some costumes like beer cans and go as a 6 pack of Bud Light...

Birthday suites

This may be old, but each couple can go as a candy bar (with and without nuts)....

M&Ms plain (F), M&M peanut (M)

Mounds (F), Almond Joy (M)

Hershey Bar (F), Hershey Almond (M)

teenage mutnant ninja turtles (humming the theme song in my head right now...)

or the wizard of oz characters