These ideas should help spark your creativity whether the Halloween costumes are for a couple, a parent and child, or siblings:
Abbott and Costello
Aladdin and Jasmine
Austin Powers and Vanessa
Baby Boy and Baby Girl
Bamm-Bamm and Pebbles
Barbie and Ken
Barney and Betty Rubble
Batman and Catwoman
Beauty and The Beast
Bee Keeper and Bee
Beavis and Butthead
Big Bad Wolf and Little Red Riding Hood
Biker Couple
Black Eyed Peas
Bonnie and Clyde
Boxer and Ring Girl
Bride and Groom
Bug and a Can of Raid
Bullfighter and Bull
Butler and Maid
Cat and Fish
Cat and Mouse
Caveman and Cavewoman
Charlie Brown and the Red-Haired Girl
Christmas Tree and Gift
Chucky and Chucky's Bride
Cookie and Glass of Milk
Corpse and Widow
Couch Potato and Grumpy Housewife
Couch Potato and Remote Control
Crocodile Hunter and a Crocodile
Danny and Sandy from Grease
Delivery Man and Package
Devil and Angel
Doctor Evil and Mini Me
Doctor and Nurse
Doctor and Patient
Dog and Owner
Dog and Fire Hydrant
Donald and Daisy Duck
Dora the Explorer and Diego
Dragon and Damsel in Distress
Dragon and Knight
Exterminator and Mouse
Farmer and a Farm Animal
Fireman and Dalmatian
Fisherman and Fish
Fisherman and Mermaid
Flower and Bee
Fly and Fly Swatter
Football Player and Cheerleader
Frankenstein and Bride of Frankenstein
Fred Astaire and Ginger Rodgers
Fred and Wilma Flintstone
Gangster and Flapper
Ghost Prom Couple
Ghostbuster and Ghost
Gilligan and Mary Ann
Goldilocks and a Bear
Gomez and Morticia Addams
Good Witch and Bad Witch from Wizard of Oz
Greek God and Goddess
Green Eggs and Ham
Hans Solo and Princess Leia
Hansel and Gretel
Hercules and Zena
Hershey's Kiss and Hug
Hula Dancer and Drummer
Hunchback of Notre Dame and Esmeralda
Jack and Jill
Jack and Sally from Nightmare before Christmas
Jane and George Jetson
Jeannie and Major Nelson
Kermit and Miss Piggy
Ketchup and Mustard
King and Queen
King Kong and Fay Wray
Lassie and Timmy
Laundry Basket and Static Cling
Laurel and Hardy
Lawyer and Car Accident Victim
Lion Tamer and Lion
Little Bo Peep and One of Her Sheep
Lone Ranger and Tonto
Love Birds
Lucy and Ricky Ricardo
M and Ms Candies
Mac and PC
Macaroni and Cheese
Mad Hatter and Alice In Wonderland
Magician and Bunny
Mario and Luigi
Maytag Repairman and Washing Machine
Me and My Shadow
Mickey and Minnie Mouse
Monkey and Banana
Mouse and Cheese
Mr. and Mrs. Potato Head
Mummy Bride and Groom
Napolean Dynamite and Deb
Ozzy and Sharon Osbourne
Peanut Butter and Jelly
Peter and Lois Griffin from Family Guy
Peter Pan and Tinkerbell
Phantom of the Opera and Christine
Pirate and Parrot
Plug and Socket
Plumber and Toilet
Pocahantas and John Smith
Police Officer and Convict
Popeye and Olive Oil
Priest and Nun
Prince and Princess
Prince Charming and Cinderella
Princess and a Frog
Princess and the Pea
Princess Zelda and Link
Prisoner and Prison Guard
Queen of Hearts and Joker
Rabbit and Carrot
Raggedy Ann and Andy
Rapunzel and the Prince
Regis and Kelly
Robin Hood and Maid Marian
Robinson Crusoe and Friday
Rocky and Bullwinkle
Romeo and Juliet
Salt and Pepper
Santa and Mrs. Claus
Scarecrow and Dorothy
Scarlett O'Hara and Rhett Butler
Scooby Doo and one of the Mystery Gang
Sheik and Harem Girl
Sherlock Holmes and Dr. Watson
Shrek and Fiona
Snow White and a Dwarf
Sonny and Cher
Spaghetti and Meatballs
SpongeBob and Sandy the Squirrel
Square Dance Couple
Squirrel and a Nut
Starsky and Hutch
Stepford Wife and Husband
Superman and Wonder Woman
Sylvester Cat and Tweety Bird
Tarzan and Jane
Thing 1 and Thing 2
Toothpaste and Toothbrush
Toothbrush and Bottle of Listerine
Tortoise and Hare
Traffic Light and Speed Bump
TweedleDee and TweedleDum
Uncle Sam and the Statue of Liberty
Upper and Lower G.I.
Vampire and Victim
Ventriloquist and Dummy
Wall-E and Eve
W.C. Fields and Mae West
Weatherman and 'Chance of Rain'
Wilbur and Orville Wright
Winnie the Pooh and Tigger
Winter and Summer
Witch Doctor and Head Hunter
Zookeeper and Animal
Abbott and Costello
Aladdin and Jasmine
Austin Powers and Vanessa
Baby Boy and Baby Girl
Bamm-Bamm and Pebbles
Barbie and Ken
Barney and Betty Rubble
Batman and Catwoman
Beauty and The Beast
Bee Keeper and Bee
Beavis and Butthead
Big Bad Wolf and Little Red Riding Hood
Biker Couple
Black Eyed Peas
Bonnie and Clyde
Boxer and Ring Girl
Bride and Groom
Bug and a Can of Raid
Bullfighter and Bull
Butler and Maid
Cat and Fish
Cat and Mouse
Caveman and Cavewoman
Charlie Brown and the Red-Haired Girl
Christmas Tree and Gift
Chucky and Chucky's Bride
Cookie and Glass of Milk
Corpse and Widow
Couch Potato and Grumpy Housewife
Couch Potato and Remote Control
Crocodile Hunter and a Crocodile
Danny and Sandy from Grease
Delivery Man and Package
Devil and Angel
Doctor Evil and Mini Me
Doctor and Nurse
Doctor and Patient
Dog and Owner
Dog and Fire Hydrant
Donald and Daisy Duck
Dora the Explorer and Diego
Dragon and Damsel in Distress
Dragon and Knight
Exterminator and Mouse
Farmer and a Farm Animal
Fireman and Dalmatian
Fisherman and Fish
Fisherman and Mermaid
Flower and Bee
Fly and Fly Swatter
Football Player and Cheerleader
Frankenstein and Bride of Frankenstein
Fred Astaire and Ginger Rodgers
Fred and Wilma Flintstone
Gangster and Flapper
Ghost Prom Couple
Ghostbuster and Ghost
Gilligan and Mary Ann
Goldilocks and a Bear
Gomez and Morticia Addams
Good Witch and Bad Witch from Wizard of Oz
Greek God and Goddess
Green Eggs and Ham
Hans Solo and Princess Leia
Hansel and Gretel
Hercules and Zena
Hershey's Kiss and Hug
Hula Dancer and Drummer
Hunchback of Notre Dame and Esmeralda
Jack and Jill
Jack and Sally from Nightmare before Christmas
Jane and George Jetson
Jeannie and Major Nelson
Kermit and Miss Piggy
Ketchup and Mustard
King and Queen
King Kong and Fay Wray
Lassie and Timmy
Laundry Basket and Static Cling
Laurel and Hardy
Lawyer and Car Accident Victim
Lion Tamer and Lion
Little Bo Peep and One of Her Sheep
Lone Ranger and Tonto
Love Birds
Lucy and Ricky Ricardo
M and Ms Candies
Mac and PC
Macaroni and Cheese
Mad Hatter and Alice In Wonderland
Magician and Bunny
Mario and Luigi
Maytag Repairman and Washing Machine
Me and My Shadow
Mickey and Minnie Mouse
Monkey and Banana
Mouse and Cheese
Mr. and Mrs. Potato Head
Mummy Bride and Groom
Napolean Dynamite and Deb
Ozzy and Sharon Osbourne
Peanut Butter and Jelly
Peter and Lois Griffin from Family Guy
Peter Pan and Tinkerbell
Phantom of the Opera and Christine
Pirate and Parrot
Plug and Socket
Plumber and Toilet
Pocahantas and John Smith
Police Officer and Convict
Popeye and Olive Oil
Priest and Nun
Prince and Princess
Prince Charming and Cinderella
Princess and a Frog
Princess and the Pea
Princess Zelda and Link
Prisoner and Prison Guard
Queen of Hearts and Joker
Rabbit and Carrot
Raggedy Ann and Andy
Rapunzel and the Prince
Regis and Kelly
Robin Hood and Maid Marian
Robinson Crusoe and Friday
Rocky and Bullwinkle
Romeo and Juliet
Salt and Pepper
Santa and Mrs. Claus
Scarecrow and Dorothy
Scarlett O'Hara and Rhett Butler
Scooby Doo and one of the Mystery Gang
Sheik and Harem Girl
Sherlock Holmes and Dr. Watson
Shrek and Fiona
Snow White and a Dwarf
Sonny and Cher
Spaghetti and Meatballs
SpongeBob and Sandy the Squirrel
Square Dance Couple
Squirrel and a Nut
Starsky and Hutch
Stepford Wife and Husband
Superman and Wonder Woman
Sylvester Cat and Tweety Bird
Tarzan and Jane
Thing 1 and Thing 2
Toothpaste and Toothbrush
Toothbrush and Bottle of Listerine
Tortoise and Hare
Traffic Light and Speed Bump
TweedleDee and TweedleDum
Uncle Sam and the Statue of Liberty
Upper and Lower G.I.
Vampire and Victim
Ventriloquist and Dummy
Wall-E and Eve
W.C. Fields and Mae West
Weatherman and 'Chance of Rain'
Wilbur and Orville Wright
Winnie the Pooh and Tigger
Winter and Summer
Witch Doctor and Head Hunter
Zookeeper and Animal