This is the cake I did for Halloween 2009. I had entered it into a few contests online, and it took second place on both instructables.com and cakecentral.com. Thanks to all of those who voted for me!
The witch is made out of rice krispie treats formed over a PVC pipe with a base and covered with MMF (marshmallow fondant). The pipe was wired with LED lights that lead up to her eyes. Her face detail was hand painted with gel and powdered food coloring. She stands about 14" tall. The witch took about 1 week to complete.
The cauldron is a layered cake covered in fondant also and airbrushed with food coloring. The "witch's brew" was done using a poured sugar technique in which I made a form then poured in the lollipop confection and allowed it to harden. The same concoction was used for the pulled sugar pieces. The cauldron also sits on a PVC pipe with the lights coming up through the middle then wound directly underneath the sugar "brew" giving it an eerie glow.
The pumpkins are made entirely of fondant that was shaped around plastic covered styrofoam balls. They were allowed to sit and dry hard, then they were cut in half and "glued" back together. I then had a few lights coming up through the base to light the pumpkins.
This is some of the detail that you can't see in the picture of the whole cake scene. There was a tree stump that was a 6" round layered cake covered with butter cream, textured, then airbrushed. A piece of hand painted fondant for the top supported the fondant frog (and frog parts), mortar and pestle, and of course, no witch can go without her spell book ;) There was also an ax leaning up against the tree stump and it was made of fondant as well.
The entire project took about one month to complete (including building the base and making the supports) and for the pieces to dry. The actual cake baking and construction, putting all the pieces together, only took one day to complete.
The Witch's Kitchen Cake - More DIY How To Projects