Looking through the effect tga/dds files it looks like spelb2.tga is what is used for level 1 abjuration spells like Minor Shielding. This is also confirmed in the thread linked above by Telin who was investigating the additional particle effects while leveling up. We can also see the same NPCAegolism name.
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This is from spellsnew.edd. Now its time to start playing with everything within this block of hex.
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Example of the tga which is being emitted by the emitter function.
UPDATE:
I've been changing the values in the block of hex for this spell emitter. So far I have been able to do just about everything except change the direction the particles are going. I've been able to change opacity, number of particles, spread, etc. Continuing onward.