It is impossible to complete these two motif sets. You never see them advertised in chat. The vendors in Deshaan and Rawl have the same repetitive items for sale (for months without change).
I've even tried farming them in Cyrodiil chests. I've heard that you have a 50/50 chance of receiving a motif from a chest. That's BS. Of the 30 chests I've opened all I've received is 3 motifs (all
pact). Can any one tell me how to acquire these motifs? I'm halfway through both motifs sets now and would like to make stylist master, but have no idea how to complete them.