Elvis is a good costume
Some good ideas for costumes for couples include Marge and Homer Simpson and Lucy and Ricky. They make for great costumes!
At your home make costumes that you like from tv or books if you don't know how find someone that is really good at making the costumes. Good ideas for costumes are naruto character costumes or any other costume you like.
There are many great scary costumes for women! Bride of frankenstein, witch, or even a zombie are some ideas. Here, this website sells some spooky costumes for woman: http://www.frightcatalog.com/Halloween-Costumes/Womens-Costumes/Horror-Costumes/
There are some good websites that have ideas for couples costumes. Sexycostumes.com has some choices for different sexy sailor costumes, plus many other ideas.
Some excellent costumes for kids this year include Disney Princesses for girls and Captain America for boys. The Angry Birds costumes are also going to be very popular.
the scream is always a classic
ghost and witch
It depends on the age of your daughter. Some witch costumes for kids can be found on halloweenexpress.com. A good site for adult witch costumes is nightmarefactory.com
How about trying to find some good costumes on line? There are many shops which offer interesting costumes, Other than that try your local fancy dress shop.
Some excellent ideas for couple Halloween costumes include past presidents like Hillary and Bill or Bonnie and Clyde. You can get costumes at Party City or even stores like Target.
There are several online stores that sell a wide variety of Halloween costumes. Some of the most popular sites are buycostumes.com, costumesupercenter.com and anytimecostumes.com all these has a great selection for kids and adults.