Some ideas:
Her favorite animal
Her favorite pop star
A group costume with her friends
Her favorite literary character
Her favorite movie character
Her ideal future career
A classic Halloween costume that's not too gory (Mummy, vampire, werewolf, witch)
Her favorite food
A punny costume
You can get some creative costume ideas at http://costumeideazone.com/. You can also get some ideas at http://www.indigo.org/halloween/page2.html
Lady Gaga
There are websites devoted to helping you create ideas for costumes such as www.costumeideazone.com and www.101halloweenideas.com. You could also try asking friends for ideas.
This website: http://www.parents.com/holiday/halloween/costumes/ has some fun and unique costume ideas for your new born. But remember to dress them in a warm costume.
JoAnn's craft store.
Like Ghost Rider
If you are looking for unique costume ideas, you can find them at http://www.essortment.com/halloween-costume-ideas-50-unique-weird-ideas-52253.html. You can also find unique decorating ideas at http://www.halloween-website.com/decorating.htm
You can find unique Halloween costume from website such as costumeideazone.com; costumeideazone.com/CIZ/CostumesByCategories.aspx?c=9; www.halloweencostumeideas.com
Researching online is a great way to find unique costume ideas to suit your needs. I have found a great website for you that will give you several different ideas for halloween costumes. http://costumeideazone.com/
Two vampires, theyre totally sexy.
The funniest Halloween costume I've ever seen was Hillary Clinton - pant-suit and all.
Scream, Michael Myers, Chucky,