Sorcerer's Marks and Morpheus' "The Academy"

Sorcerer's Marks and Morpheus' "The Academy" which I am reading again thanks to Carpe Diem's blog entry 'Looking for a story'

While reading "The Academy" the MC is discovered to have a Sorcerer's Mark

This reminded me of a similar story of a magic academy, but this one was more of a Summer School\Camp, one of the MC's friends is a goth and her 'SYMBOL' (for want of a better term as I can't remember what the story called them) was a "Jack O Lantern"

The MC casts a 'SYMBOL' Spell and becomes the embodiment of their 'SYMBOL'