In the interest of getting people talking, and because Dekon told me too, I'm going to start a "design a spell" contest. Unfortunately there are no prizes, except for the satisfaction of winning.
So use this thread to enter ideas for spells. Discuss and enjoy. The winner will be picked based on comments by other users. I'm not coming up with any complicated judging system at the moment, as the point of this is more to discuss than to win.