Collector's Caravan 6.0.0:

Update 6 brings lot's of collectibles and changes, with  lot's of new items to add to your collection!

Let's jump right into update 6:

7 New Primal stones/ Cave paintings have been added, each their their descriptive names:
-Spear
-Runner
-Sprinter
-Sun
-Prey
-Hand
-Hunter

Along with this change, you can find these by slaying Bundle Monsters or buying the Primal Stone Bundle with the Collector VIllager! (The 7.0.0 update and above will include structures with these Stones, but as for now you can find them like this) 

6 New Tiki mask were also added! these are not wearable but they serve as decoration blocks, the variants are:
-Tiki Mask Mad
-Tiki Mask Livid
-Tiki Mask Calm
-Tiki Mask Observant 
-Tiki Mask Happy
-Tiki Mask Rare

The "Tiki Mask Rare" has a 1% Chance of dropping from big bundle monsters. A truly prestigious item to own.

4 New wearable hats are now available:
-Small Tiki Mask 
-Small Tiki Mask Livid
-Inuit Goggles 
-Canadian Tribal Mask

For smaller changes:
Bug fixes
Added descriptions to Clay tablets 
Reworked Textures (Mainly the wearable hats)
New advancements