Mr Hornet, love the link.
Back in the day the 'obligitory teenage rock band (thinks; great band name!)' I was in we used chord names written on bits of paper that were randomly plucked from a container, we found that idea would work mainly with 5th chords. Later on we used 8 sided gaming dice. I guess it seems we had too much time on our hands!
(for those who are inquisitive check out the track 'can't resist a melody'
Sheriff Jack: Amazon.co.uk: MP3 Downloads)