Because of the very recent (and almost simultaneous!) news about the RuneQuest 6 and AEON cover arts, both of them very much inspired by Louise Perrin's classic RuneQuest cover art, my mind has been drifting around the Perrin name lately and, as a consequence, I have also thought about Steve Perrin (possibly my favourite game designer ever).
This spurred me to look for the Perrin Conventions online again. Wow... great stuff. I'll certainly be using them a lot for Timinits & Trolls. Googling Steve's name on the internet also brought up an interview from about one year ago, which I had completely missed at the time. Definitely an interesting read, which I recommend.