I'm just guessing based on what I've read as far as it will be in the game, but I assume that the Verduren CAN learn new patterns. I gather this from this text,
They can blend into live foliage with uncanny camouflage, particularly the type of fauna that was their bower. However, other Verduren can and do transfer their knowledge of other flora between clans, teaching their patterns to other Verdurens. src
This would lead me to believe that you can learn new patterns. It could either be a game mechanic where as you grow in power as a Verduren, you gain the trust of new clans and the blessing of their pattern, or it could be assumed that it's done, and camouflage could be easily shared for you giving you the power to blend with any foliage immediately upon learning how to camouflage.