Ah you bad man, made me get out those old programmes! Seriously, I was wondering myself.
Some of those less-usual tartans and the bands that wore them, from the 2004 World Pipe Band Championships programme:
Lady Borrowdale's Gift: Drambuie Kirkliston https://www.youtube.com/watch?v=zDrR0MYrKjs
Princess Margaret Rose: Uddington Strathclyde https://www.youtube.com/watch?v=RT-gY-VoB7A
Princess Elizabeth: Denny and Dunipace https://www.youtube.com/watch?v=yUhHjD_tsus
William Murdoch: City Of Edinburgh https://www.youtube.com/watch?v=JSJST9gRLTs
and this interesting one:
Cleikum: Tweedvale https://www.youtube.com/watch?v=Z9PO1TBWXBk
Bookmarks