There are in total 5 rare racial motifs, these are:
- Imperial motif
- Primal motif
- Barbaric motif
- Ancient elves motif
- Daedric motif
Dwemer motifs are not required.
In order to actually read these, you need high level of crafting.
Primal requires rank 5, barbaric rank 6, ancient elves rank 7 and daedric rank 8. So you need to level your blacksmithing, clothing or woodworking to atleast level 35.
Deconstructing items is the best way to level crafting skills.
Obviously these are very rare especially the imperial one. Imperial motif can be found in any world but Primal and Barbaric can ONLY be found in Silver world whereas Ancient elves and Daedric can ONLY be found in gold world.
Silver world is the second faction you'll be sent to after finishing the main quests
For example in the Daggerfall covenant, after you finish the main quest you'll be sent to the Aldmeri Dominion when talking to Cadwell. It should also give you 'Cadwell's silver' quest.
Gold world is the third faction that you'll be sent to after finishing your silver world.
Like the alliance motifs, these can only be found in containers that drop lockpicks and racial crafting ingredients but NOT in containers that drop provisioning ingredients.
Another way is to search the guild stores but these are very expensive compare to the alliance one. If you're lucky then you can find a cheap one at around 50k but most of the time they're 80 to 150k.
You can also buy them from the crown store but it cost 10000 crowns which essentially mean $100.