With touring bikes such as the LHT, it's more a question of what won't work rather than what will work. I have a Nashbar frame with Avid Shorty brakes and 700c wheels, but I went with Kool-Stop V-type cartridge pads. The pads fit under the fork and the seatstays with plenty of clearance, and when it comes time to change pads, just pull out the pin, swap pads, and put the new pin in. Other "mountain" or "cantilever" pads with threaded hardware should work too.

As for pad color, for regular aluminum rims, the salmon or black/salmon dual compound pads should be fine. Either one works fine for me.