I'm just having too much fun with this class. Here are two more marks, one intended for monks and the other for very zen-like characters who pursue a philosophy of balance.
Weapon Mark:
Mark of the Fist
The effects of this mark only work when you are completely unarmed. The attacks gained from this mark are considered natural attacks and can be made with any part of your body, not just fists and feet, but you should specify which body parts are being used (ie, elbows, knees, head, fists, feet, shoulder slam, etc) in order to determine your eligibility for feats like multiattack and improved natural attack.*
Shape: (Ex) You gain Improved Unarmed Strike as a bonus feat, and your unarmed strikes deal more damage than normal for a character of your size – 1d6 + STR damage per attack if you are medium size. You have two unarmed strikes, plus one more per 5 ILs. Each time you gain a new unarmed strike, the damage dice for your unarmed strikes increases one size (so at 5th IL, you would gain a third unarmed strike and your unarmed strikes would deal 1d8 + STR damage on a successful attack).
Name: (Ex) As a full-round action, you can make a single attack with each of your unarmed strikes without penalty, or move your speed and make an attack with two unarmed strikes without penalty. At IL 10, you can make a single attack with all your unarmed strikes without penalty as a standard action, or move your speed and make a full attack with each unarmed strike as a full-round action.
Essence: (Ex) Once per round, when you hit an enemy with two or more unarmed strikes, you can force that enemy to make a Fortitude save (DC 10 + 1/2 your initiator level + your Strength modifier) or be stunned for 1 round; the enemy takes a penalty on this save equal to the number of times you hit him.
* Consult your DM on the appropriateness of these rules for your character and campaign.
Ideal Mark:
Mark of Balance
Shape: (Ex) You gain a +4 bonus to resist any effect that moves you against your will (such as being grappled by a giant, tripped by a wolf, or knocked prone by wind or a grease spell) and a +10 bonus to balance checks.
Name: (Ex) You may substitute your Fortitude save for your Reflex or Will save, if your Fortitude save is higher.
Essence: (Ex) You gain a +1 untyped bonus to all ability scores.