a) A random melody that jumps to the next tone every 0.5 seconds (alternatively: as a glissando rather than a jump):

patches/a-6-randommelody500.pd

b) A metronome with irregular random rhythms (for which you can set the average tempo):

patches/a-7-irregmetro.pd

c) A metronome, that beats five times at tempo quarter note = 60 and five times at quarter note = 100:

patches/a-8-twometro.pd

d) A melody that changes between very high and very low registers every two seconds:

patches/a-9-highlowmelody.pd