Oh hey, yeah. Good call.
I'll just assign each school a color, how about...
Abjuration - White
Conjuration - Green
Divination - Yellow
Enchantment - Violet
Evocation - Red
Illusion - Blue
Necromancy - Black
Transmutation - Orange
Then if you roll Spellcraft, you can describe the results IC in terms of the visual component...with the strength of the aura being how bright it is. Etc.