Hello all. Finding motifs has never really been an issue for some of us while others have a harder time at it. What i find is normally true is that for those of us who are always checking furniture and back packs are normally the ones finding them. but lets talk about the Rare Motifs.
To find the Rare motifs you first need to have started Cadwells silver (Veteran Level 1).
Primal and Barbaric Motifs can be found in Vet levels 1-5
Ancient and Daedric Motifs can be found in Vet levels 6 and up
When i farm Primal and Barbaric I go to Stormhold. City of Wayrest at Wayrest Castle. thats the best spot for finding those as their are a little over 50 searchable spots for them
Or if you are after Ancient and or Daedric Motifs. Grahtwood city of Elden Root. you are going to want the Altmer Embassy. This is the best place that i have found in my searches for places to farm.
Well I hope this helps you out on either your quest to farm or just to learn them.