I'd use the Falling Damage rules as a start.
If the poor sucker would have been thrown 10' feet but got stopped by a wall after 5, calculate damage as a 10' fall.
If they would have gone 30 (which is a completely inhuman distance to throw any living thing that isn't palm-sized), calculate for 30' even if they hit the wall after 10.
If you're feeling generous, let the Pally add his strength bonus.
No rules exist.
However, if one of my players wanted to try this, I would probably make it part of the grappling rules, by adding another thing you can do while you're maintaining the grapple (but only if he has Throw Anything):
Throw: for every 5 points by which the character exceeds his opponent's CMD, he throws him 5 feet. Calculate the damage taken by the throw as if from a fall of the same height as the length of the throw.
I'd make that my starting point, but make it clear to the player involved that I might need to nerf it later if it becomes too effective.
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No rules exist.
However, if one of my players wanted to try this, I would probably make it part of the grappling rules, by adding another thing you can do while you're maintaining the grapple (but only if he has Throw Anything):
Throw: for every 5 points by which the character exceeds his opponent's CMD, he throws him 5 feet. Calculate the damage taken by the throw as if from a fall of the same height as the length of the throw.
I'd make that my starting point, but make it clear to the player involved that I might need to nerf it later if it becomes too effective.
I'll do that, but I'll make it a Feat first...
I'd make it a Combat Maneuvor that could only be attempted after a successful Grapple (all the usual combat Maneuvor rules and potential feat chains applying)
That cuts out the need for Throw Anything (which would really only matter if someone was trying to throw another person as an attack.)
It's actually a great idea for monsters like Ogres, who have big CMBs and a racial feat that let's them use anything they can pick up as a melée or ranged weapon.
When throwing someone into someone else, I'd calculate distance and falling damage normally, then split it between the two (fractions going in favor of whoever weighs more/is wearing better armor).
I wouldn't allow it to be an Attack Roll. Instead I'd handle it as a Line attack that effects the first person in the line to fail a Reflex save against a DC equal to the result of the CMB roll.
"Improved" feat versions would require impressive BaB and Str requirements and might allow you to "cleave" past one target and into others, or throw people into the ground so hard that they have to make saves against being Sickened or Dazed.
In the APG are rage powers for the barbarian .. lesser hurling, hurling etc.
Maybe the ruling helps.
Hurling, Lesser (Ex): As a full-round action while raging, the barbarian can lift and hurl an object up to one size category smaller than herself with both hands or two size categories smaller with one hand as an improvised weapon with a range increment of 10 feet. This inflicts damage as a falling object (Core Rulebook 443) plus the barbarian's Strength bonus. This damage is halved if the object is not made of stone, metal, or similar material. This is a ranged touch attack, and the target may attempt a Reflex save (DC 10 + 1/2 the barbarian's level + the barbarian's Strength modifier) for half damage. The barbarian may apply Power Attack to this attack as a one- or two-handed weapon, as appropriate.
Yeah, but let's be honest, that's a pretty awful rage power.
I am at work and don't have the rule book in front of me, But Mutants and Masterminds is a psuedo D20 game, that has rules for Knockback and throwing characters, but with out the book in front of me, not sure if those rules will convert easily to Pathfinder, they are also not open content I believe so would be hard to find easily on the interwebs.
M&Ms Knockback rule is tightly bound to the even-more-abstract damage system of that game.
I also don't have the book in front of me, but IIRC, any attack that stuns the target (target fails Toughness save by 10+) knocks them back one range increment per point of damage that the attack does, reduced by 1 range increment per point of Str bonus (and some powers further reduce it).
Since the range increments go 10', 25', 50', 100', 250', etc, that can generate some rather impressive knockback distances with very little damage to the target (except for the extra damage from their unplanned flight).
It's a good system, and it works beautifully in a superhero setting, but converting it into Pathfinder would be very difficult, and potentially damaging to the combat system.