I've been using PD for a while but have only just started writing music which is substantially based around PD-generated/sequenced/processed sounds. i thought you might like to hear some of it:
the general process was to first write and record all the raw material, melodies, chord sequences etc, and then get going in PD. PD was used mostly for close-in sequencing like drums, bass lines etc, a lot of generating random variations on the melodies and rhythms, and general audio mash-up, drums especially. then all the final "large-scale" sequencing was done with Cubase.
mirror with a memory probably had the least PD input - the beginning was generated largely randomly from a couple of source melodies but that's about it. this probably doesn't count, but the casio-y sounds (if we're thinking of the same bits) were made from an old analogue synth which has this excellent ring modulator. i wrote a little calculator in PD to figure out what the resulting overtones would be from a combination of two pitches, and then composed the end chord sequence based what was possible.
hex49 had the most PD going on, the entire opening was sequenced with a load of line objects. it's hard to write large-scale structures in PD, it seems more suited to small loops and gradual change. will keep plugging away at it though!