You could do a variation on the princess/fairy/bride costumes for a monster princess or zombie bride. If you want a cute costume you could do something like a crayola crayon, indian princess or light bulb.
wolf and vampires for boys,witch or vampires for girls
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.
Fairy costumes!!!
Cute tween costumes could be a cupcake, a pirate, or a Disney princess.
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.
If you are referring to Halloween costumes, some ideas include: - The Powerpuff Girls - Three Blind Mice - Rock, Paper, Scissors - Three Little Pigs - Three Musketeers
BarbieThumbelinaTwinkle costumes
There are some dresses fore the girls and some little cowboy costumes and the boys: i dunno! But i do know that the boys have cowboy costumes as-well as pirate costume's! :)
You can try your local discount stores or look in the paper to see if they have ads for costumes on sale. Most local discount stores will have some kind of discount on costumes the closer you are to the holiday.
Me I would be a zebra fluffy bunny or maybe a cheetah
Movie themed costumes are quite popular amoung the younger girls this year. Some of the top ones are Hannah Montana, Harry Potter, Twilight characters and Avatar.
Witch or princess costumes are popular for girls and devil costumes are popular for boys. Ghost costumes are also popular.