Well, my brother and I (mostly my brother) hashed out a monk class (though we didn't give it the psionic power source) in the early days of 4e. I'd have to search for it, but, the distinctive mechanic for it was stunt points (designed to compensate for the lack of magical weapons/armor--since ki foci had not been presented to us yet. I believe we also gave the monk proficiency with unarmed and, possibly, improvised attacks (+2).
Basically, stunt points worked like this:
The monk could tie a stunt into each action (so, usually, 3 per turn) and attempt to pull it off with a DC 15 skill check. If the monk chose s/he could try for more stunts by chaining them into combos, but the DC increased by 5 for each additional stunt in the chain/combo (so, a better option for higher-level monks). Each successful stunt point granted a flat +1 Attack, +1 Damage, and +1 to all Defenses until the start of the monk's next turn. We used tokens to represent them, since writing the bonuses down each turn would have been quickly tedious.
It was fun and evocative and relatively quick, but the monk's player has to want to work for his/her bonuses (although the first three are pretty easy).
