I've got a few suggestions/ideas.

A bone crown.

Bone Armor.

A bone bow and crossbow for the ranged pawns. Could also require human leather to make.

Bone spear, staff, and claws.

Jeweled version of each of these items and the items you already have made that uses jade or a patch to work with the gems added by jewelry or if it can be, set it up to auto detect gems added from any mod. If possible add different buffs depending on the gem used, such as trade price, negotiation, psychic sensitivity etc. Have the crown(jeweled and regular) and jeweled armor count as royal attire.

Not sure how well this might fit with the theme of the mod but since it would help with the tribal part of the game I figured I'd mention it and it could easily be incorporated with the bones of this mod. A dart trap. Basically acts as a turret that either has to be placed on an existing wall or like a vent takes the place of a wall and can only shoot in a straight line in the direction it is facing and only a short distance to kind of mimic someone tripping a wire or stepping on a pressure plate to set it off. could also make it not be able to place directly next to another one for balancing so you can't line the entire wall up with them ( would probably best be used at the end of short tunnels/corridors) also like turrets you refill them with bones. Could also have to turn bones into bone darts before they can be used for refilling the traps to balance it even more. maybe limit the amount of "ammo" to like 15-20 sharpened bones before it needs refilled. As for other balancing issues for the trap, maybe it shoots really quick like a real dart trap would but it only does 1-2 or 1-3 damage and has low armor piercing so at most it could take down 1 maybe 2 low armored enemies before it needs refilling. If you aren't too worried about it fitting the mod exactly since this is about bones you could also add crating of wood darts for a cheaper and weaker version and as a research option later on steal and plasteel versions that do more damage and higher armor piercing for late game. It might be easiest to make each dart trap be a different building depending on what ammo it will use so you don't have to code in a way for the trap to know what ammo it was filled with to determine the damage and armor piercing so like a wood dart trap, bone dart trap, steel, plasteel.

Could you give the items qualities?

My suggestion is for an upgraded version of the bone weapons.

As of now, the bone weapons fall behind after some tech advancing, being almost useless by the time one gets to medieval. My suggestion is for a medieval-tier research to create better version of the dagger, sword, and club by mixing bones and steel. With appropriate weapon icons to make the weapons look smoother and more uniform to match a traditional knight/medieval aesthetic.(picturing the dragonbone weapons from Skyrim)

Animal bones
Animals have bones (most of the time)
And it could be cool maybe for more predator animals to give players better charms. The same way irl humans couldnt care less about a cows molar, but go ♥♥♥♥♥♥♥ when they see fangs