Stylize Spell

 
Prerequisite(s): Access to the illusion school (or a lack of prohibition against using it)
 
Benefit: You can subtly change the appearance, sound, taste or smell of spells you cast. The changes to the spell must not have any appreciable game effect outside of making the caster seem impressive. For instance, making a wall of fire appear as something that isn’t hot and dangerous would be out of the question, but having it whisper your name would be acceptable. The effects of this spell should never make something dangerous seem less so or something safe seem dangerous. It should never change the apparent area of effect of the spell, disguise the spell in any way, or simulate the appearance of another spell.
 
Source: Mongoose Ultimate Feats