Couples Halloween costumes are popular for many reasons. One of the reasons that couples costumes are popular is because it makes a statement that "we're together". Even if you socialize separately at the party, everyone will know that the Queen came with the guy in the King costume.
However, it does take some creativity to come up with a couples costume concept. If you are creative, you will have no problems. If you are not creative, you just might have some problems.
You can find inspiration for your costumes everywhere. Think of all the famous couples there are out there and you will understand the concept. If you can not think of a single famous couple at this point, you are not alone.
Here are some ideas to get you started: Peter Pan and Tinkerbell; Superman and Wonder Woman; George Bush and Condoleeza Rice; Robin Hood and Maid Marion; Egypt Frankenstein and his bride. Perhaps this list has given you some good ideas already. If not, there are still plenty of other great costume ideas available.
You can keep the costumes authentic or you can spice them up a bit to make the characters look sexy. Couples costumes that fit into this category include: a prison guard and prisoner; the Prom King and Prom Queen; a guy and girl cheerleader; or the Wolf and Little Red Riding Hood.
If you want a very creative couples costume idea, you may think about these ideas: a nut and bolt; mustard and ketchup; bacon and eggs; apple pie and the American flag.
Whatever costume you decide, it is important to have fun. For that reason, you may want to try some funny couples costumes. Fun costume ideas include: Annette and Frankie; Elvis and Priscilla Presley; Sonny and Cher; Granny and Jed Clampett; Gomez and Morticia Addams; Egypt Zeus and Aphrodite.
If you want to be unique, you may want to choose some of the more obscure couple costumes. If you go to a party dressed as Fred and Wilma Flinstone for example, you may find another couple dressed in those same costumes. If you go to the party as Little Bo Peep and a Sheep, you may not have that issue.
Accessories can really help to make the outfit. For example, the Morticia Addams costume would not be complete without a long black wig. Likewise, Gomez absolutely must be holding a large cigar in his hand. The prison guard should have hand cuffs while the cheerleaders will need pom poms and a megaphone.
You can take the time to make your own costumes. However, this could cost a lot of money and take a significant amount of time. This is especially true if you do not know how to sew.