Last year my daughter (10 years old) and three of her friends all wanted to go trick or treating together. As Mom's of these girls we thought it would be cute for them to match. We made them bright and colorful witch's costumes adorned with fake eyelashes and lots of sparkle.
Each girl picked her color. We didn't use the traditional Halloween colors and I think that is what made it even cuter. We had purple, bright green, a bright blue and orange.
For instance my daughter was purple. She had purple high tops so we knew that would work out great. I bought a simple black hat and added purple feathers, ribbon and bows with lots of tulle. It was darling. I got her a purple shirt from Target ($5) and added a cute pair of witches shoes on the front. We made skirts out of tulle. We simply got elastic banding and tied tulle at different lengths in all the girls bright colors. A pair of black hose and hightops with brooms again tied up with ribbon and tulle.