I've made trichromes! Admittedly, I made them by scanning the three negatives and using GIMP to colour them, but the results were pretty interesting. There's a group on Flickr called "Trichromie" too.
If you're interested, I've got one online here.
I've got another roll of them at home undeveloped, so far. I used HP5+ and developed, IIRC, in D76.