Alright! Several years ago I came across the New York Minimalist Ensemble (they don't seem to exist anymore) and their standing call for composers to write for them. As far as I remember of their requirements is that you write for their instruments (don't ask me what they were, I don't recall, but it could be a subset of the full ensemble) and that your compositions only have 100 notes or events. From what I can recall, the definition of event was left up to the composer. It might be as simple as a note, or something a little more complex, such as a chord. John Cage might even include the silence between the noise as an event. Think of it for yourself.
So, does this sounds like a good type of challenge? Would you accept such a commission (even a non-paying one)? Just how would you plan such a composition?