Plonk http://rmx.cz/plonk/ is an unusual sequencer based on audio-visual dialogue between characters.
I started with an idea of placing objects on a stage and having a ball bouncing from them - and playing different samples.. it was quite fun, but the sound output was random too much.. even too much for me.. so I brought it back to relatively “boring” from-left-to-right-going-playhead concept..
I also made all the samples my self, by using either midi and Pure data, or playing around with oscilloscopes.