Well, there was the Book of Hallowed Might variant Paladin classes, both Chaotic and Neutral.
Both lose Aura of Courage.
The Neutral Good Paladin loses the Special Mount and removes protection from chaos, magic circle against chaos, and dispel chaos from their class spell lists, while gaining [Blessed Presence (Su): At 2nd level, neutral good paladins project an aura that affects all allies within 15 feet as if they were under the effects of a bless spell (+1 morale bonus to attacks and saves against fear)] and [Celestial Ally: At 5th level, once per day, a neutral good paladin can use a standard action to summon a good-aligned outsider as if he cast summon monster. Divide the paladin’s level by 2 (minimum 1, maximum 9) to determine the level of the summon monster spell, and use the paladin’s level as the caster level], and new restrictions on cohorts and followers.
The Chaotic Good Paladin loses the ability to Turn Undead, removes protection from chaos, magic circle against chaos, and dispel chaos from their class spell lists and replace them with protection from law, magic circle against law, and dispel law, while gaining [Shared Grace: At 2nd level, chaotic good paladins gain the ability to share the bonus that they gain through divine grace with one other character within 5 feet. The paladin can designate a new character to share his grace with each round] and [Stand Against the Tide: Chaotic paladins train
to use their foes’ numbers against them. At 3rd level, the chaotic good paladin gains a luck bonus equal to his level divided by 3 (round down, minimum 1) to Armor Class and attack rolls if engaged in melee with more than one foe], and again new restrictions on cohorts and followers alignment.
You can find that rules better explained in pages 16-17 of Book of Hallowed Might.
And I guess it's the perfect option for a Barbarian/Paladin. Been craving to use that combination for quite some time, but no groups for me recently =/
