I'm running a one-shot to playtest the system, using this scenario that I came up with: http://lostzeppo.wordpress.com/2010/05/08/adventure-seed-dresden-files-rpg-the-killing-ground/#more-88

I've got stats done for the ghosts, all I still have to do are the stats for the demon and the sorceror who summoned it.

I'm still not entirely familiar with the system yet (I'm terrible at reading PDFs), so I've based much of the demon's stats on the toad demon from Storm Front, but what I need some help with is coming up with its earth manipulating powers. Any thoughts?

Possibly the Night Watch and Day Watch movies. One of the comments a friend of mine had when I introduced himself to the Dresden Files (admittedly the TV version rather than the books) was that the way magic worked in it reminded him of Night Watch.