Not sure which forum this would go into, but I'll post it here for now.
Lately I've been noticing that gear gotten from the horde packs are unable to be dyed a different color. For things like the greenwardens mask and boots, I can kinda understand why, but for the rest, I feel they should be dyable.
All the normal gear in game (with the current exception of some of the other crown gear sets) can be dyed just fine, so its only natural that the horde pack gear can be dyed too.
I also just noticed that of all the armor featured in the crowns shop currently, only a select handful of them can actually be dyed there (not sure if this is a glitch or intended, though I hope its the former).
I personally feel that all types of gear should be dyeable, regardless of where they came from, and I hope that in the future, that all gear will be made dyeable, as it has more sense of creativity to the game, at least to me it does.