Start by looking at what is most popular at costume shops such as www.spirithalloween.com/boys-costumes. Then see what the boys themselves want to be!
Most boys like to be a hero for Halloween. Try Superman or Batman costumes for the boys. You can also look up costumeideazone for more ideas on what to wear for your kids. Try going to Walmart or Targets and find some costumes that they like.
There are many popular costumes worn for Halloween such as a witch costume. Boys costumes include super heroes and vampires.
Unique halloween costumes are the fun way to go. Here are some great ideas on costumes: http://www.essortment.com/halloween-costume-ideas-50-unique-weird-ideas-52253.html and http://www.halloweencostumes.com/exclusive.html.
Sometimes coordinating costumes can be a great way for a couple to really express themselves on Halloween. Tandem costumes like Sid and Nancy or the Bananas in Pajamas are some creative ideas you could try.
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.
It'm amazing how simple a good costume can be to make! Look at http://familyfun.go.com/halloween/halloween-kids-costumes/ for some good ideas. Happy Halloween
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/
Princess. Cheerleader. Schoolgirl. Anything with a skirt!
wolf and vampires for boys,witch or vampires for girls
There are a lot of fun, but simple Halloween costumes you can make for boys using materials and clothing you already have around the house. Pirates and Star Wars characters are a few.
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.
It depends on what costumes and decorations you would like to create. You can find some ideas for costumes here: http://costumeideazone.com/. As for decorations, the following site has a lot of great ideas: http://tlc.howstuffworks.com/family/halloween-decorations.htm.