I would love to try a pillow cake. Are there any tutorials on how to carve them, tips, etc. that someone can point me too or give me some ideas? I want to do that with a "glass" slipper on top.

There sure there is. It's in the articles section.

Here's the link:

http://www.cakecentral.com/article66-How-To-Make-A-Pillow-Cake.html

Here's one for a shoe, not sure if that is what your going for but it might give you some ideas anyway:

http://www.cakecentral.com/article69-How-to-Make-A-Gumpaste-Shoe.html

HTH!

Found this one too (if you scroll down to the bottom of the 2nd link you will see she has another cake pic there to give you a different idea):

http://cakedec.forumotion.com/Toni-s-Pillow-Cake-Tutorial-h7.htm

http://sugarteachers.blogspot.com/2009/03/how-to-make-pillow-cushion-cake-by-toni.html