Snake style: masters are supposed to be able to kill/stun/paralyze/inflict immense sms long lasting pain with a touch. They can also supposedly treat some of these (not death, obviously) also with a touch. The idea is an extension of acupuncture--certain points on the body are connected to various organs and by manipulating the flow of chi/ki, the master is able to help or hurt.
Some ideas:
1. increased "dc" to stunning fist (ie penalty to save--possible?)
2. "Bleeding" or poison effect as his touch disrupts body's harmony turning it on itself
3. piercing fists (they often hit with just the index finger)
4. Bonus to ac ( very defensive martial art)
5. Bonus to move silently (going off the map here but it makes sense--this is how snakes hunt)
EDIT:
Tiger Style: This is modeled off of Tiger Claw, yes? Assuming so (and, conceptually it works anyway) this is a quintessential "Hard" martial art.
1. Flurry of blows is very appropriate. You might want to think about giving a penalty to AC (rather than a penalty to Thac0) as it is not unknown for practitioners to take a blow in order to land a vicious combo to an unprotected--very difficult to defend and attack simultaneously--opponent.
2. Slashing fists are appropriate as they often attack with a claw like rake to the face, throat or other vulnerable area. That brings me to...
3. If any style could see a bonus to critical threat range it's this one (okay, snake and Panther/Leopard too)
4. Tameshiwari (ie board breaking). While this is not Tiger claw per se it screams "hard style". This might also be appropriate for a "Ki" ability as well. Could be targeted, do tremendous damage and even have a 'knock' effect to simulate breaking a lock.