DISCLAIMER: This should be updated overtime! <3

Dinosaurs:
Dangling Christmas Ornaments on their necks/tails (Christmas)
Scarves (Winter/Holidays)
Armor (Damaged/Non Damaged)
Ripped cloth/garbage stuck to their backs.
Thin winter coats with fluffy hoods. (Winter/Holidays)
Pumpkin/Jack-o-Lantern heads (Halloween)
Torn open muzzle guards. - The metal muzzles they use to keep dogs, in this case dinosaurs, from biting, ripped open and poking out. (I'd say closed, but we still need to bite C:<)
Nose Rings with TAG NUMBERS (Based off amount of dinos in game. Like cows)
---

Humans:
Pumpkin heads as mentioned above. (Halloween)
Human chokers/necklaces/bracelets.
Human Armor (Damaged/Non Damaged)
Fur/Feather/Dinosaur Skin cloaks/coats
Piercings. (Lips, nose, ears, etc.)
Seperate meshes for new hairstyles.
---

More to come later! <3 Suggest ideas in the comments if you want me to add them.
These are free to use, no credit needed really.
If you use one of these ideas, let me know by leaving a comment or adding me!
Have fun!