A classic is always to dress up as the flinstones....or the scooby doo gang, that's what i did last year!
Pink Ladies (from Grease)
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.
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Nifty, Thrifty, No-Sew Costumes and Props is an excellent book for Halloween costume ideas. You can also try Quick Costumes for Kids. Both are available at amazon.com.
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.
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
The most famous ideas for couples halloween costumes are Batman and Catwoman or Superman and Supergirl. Someone can find hundreds of couple costumes at different online shops like Partycity.
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.
Try party city!
Yes there are places online where you will be able to get funny Halloween costumes. A great place to go is Nextag.com. They have costumes like drunk doctor or Rasta Imposta.
Halloween is most fun for coming up with unique costumes. Get ideas or shop at www.costumecraze.com which offers animal, historic, superhero and many more costumes for children and adults.
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.