At the moment, curved and long bones have no uses besides prayer XP, but everyone already has 99 or 200m prayer XP. Instead of prayer xp, these bones could be exchanged for construction XP like OSRS.
"Curved bones may be sold to Barlak, a Dorgesh-Kaan cave goblin, for 2,000 coins each. Dorgesh-Kaan can be accessed after the quest Death to the Dorgeshuun. The player will also be given a lecture on Construction, granting 6,750 Construction experience."
The bones could be exchanged for 135,000 - 337,500 XP. They could either be buried for the XP or exchanged at a shop.
