Discipline Addition (3.5e Variant Rule)

Discipline Addition
Tome of Battle failed to give rules for creating homebrew disciplines. People created homebrew disciplines anyways. As such, rules are needed for allowing these disciplines to be used. The various choices that people find balanced are listed here and why they are that way.

The martial adept has to have the discipline on the discipline knowable list. Usually this is kept as the inverse by each discipline: Which of Crusader, Swordsage, or Warblade may take the discipline. If it says Crusader only, you cannot get it as a Swordsage.

5 Skill Points
During a level up, a marial adept may spend 5 skill points to add a discipline to their disciplines from which they may choose maneuvers.

1000 Experience
The character seeks out a martial adept capable of using at least 5th-level maneuvers from the discipline. The character trains under the master for a month or spends a month in research. At the end of the training, 1,000 experience is spent. The character gains the ability to learn maneuvers from that discipine, and may exchange manuvers know for manuevers of that discipline. The character may exchange one manuever of each level, and the new maneuvers must be of the same level as the exchanged manuevers, unlike normal.

Trade A Discipline
At character creation, or whenever the character first gains maneuvers from a class, it may choose to replace disciplines for free.

Homebrew Class
Classes, including prestige classes, could be made to handle the various disciplines you want.