Another one from my big bag of attempts to let people play with the boundaries of their classes - let me know what you think, please.
"Featy goodness"
Blinding Aura of Faith
Pre-req: Knowledge (religion) 2 ranks OR
Cleric level 1 OR
Paladin level 1
The power of your faith is tangible. You can make a declaration of your faith as a free action. Upon doing so, you emit an aura (as the cleric or paladin ability) as a paladin of three levels lower than your character level (minimum 1, or your actual cleric or paladin level, whichever is higher) and impede the ability of undead to approach you. You make a turn check as a cleric of your level, but any undead that are turned instead take a -1 penalty to melee attack and damage rolls against you and anyone within five feet. This effect can be used for up to 10 rounds/day, which need not be consecutive. This effect is not affected by any domains or feats that affect Turn Undead
As you might have guessed, this should work like a very much weakened version of Turn Undead meets Protection From Evil and provide a little boost to prospective undead hunters. Because it's not the same as Turn undead, it should even be useful to Clerics and Paladins without being overpowered.
The reasoning behind this feat is that in movies, anyone with faith can wave a cross around to drive off a vampire without having to be a priest, so a little bit of faith should prove beneficial in D&D too.