Costume-Costumes.com

go as a smurf, me a big group all painted ourselves blue, wore blue shorts, funny as f*ck

Snow White.

dress up as a punk rokker its cheap plus everyone will get a kik out of it lolz

Go to Windsor, they have the best stuff and have really good prices=]]
http://www.windsorfashions.com

cinderella

How about something easy.. like an element! As in fire, earth, water, etc

That way, you can wear the main colors from that element (without having to go shop like mad) ex: fire = red, orange ‘n’ yellow or/and gold and add a texture of that element to the ensemble ex: water = flowy chiffon blue skirt.

For this idea, makeup is SUPER important.

For fire: http://images.google.ca/imgres?imgurl=http://www.alyssaravenwood.com/Images/makeup/fire-fantasy-makeup.jpg&imgrefurl=http://www.alyssaravenwood.com/photo-albums/makeup/fire-fantasy.htm&h=993&w=750&sz=672&hl=en&start=1&sig2=tyDhdWRkwsbcD2zT2ckueQ&um=1&tbnid=5cnrZCWJ1TL_FM:&tbnh=149&tbnw=113&ei=utxvSPPLJI6UhALz243yAw&prev=/images%3Fq%3Dfire%252Bmakeup%26um%3D1%26hl%3Den%26sa%3DN

For earth: http://visualintake.deviantart.com/art/Eye-Makeup-54697074

For water: http://monkeystylin.deviantart.com/art/Makeup-Design-TRES-63724518 OR http://tenshinosakura.deviantart.com/art/Water-Sprite-Make-Up-24226404

…

Here is how to make a fire costume : http://www.ehow.com/how_6962_create-fire-costume.html

http://www.alphabet-soup.net/hall/costumeideapg2.html

Good luck!