I have an idea for a curio that you can get from taking bark of trees. It should have around a 5 - 10% chance to get when peeling bark, and may have different variants for different trees. For example, with more rare trees, there would be a higher chance of getting Amber Frozen Ant Queens and the rarer types. And on more common trees maybe Amber Frozen Ant Soldiers would have a higher chance of being collected.
You would maybe be able to make a few recipes, like a rare medicine or something with an ingredient that requires any type of Amber Frozen Ant and some forage-able herb (To give more uses to being a forager).
The base LP for the most common type would be around 500 - 600 with a very high chance to get that type, also maybe 2-3 mental weight. The XP cost should be around 40 - 45, and the study time would be something like 50 minutes. At q10 it would give the aforementioned stats, At q50 it would give around 1250 - 1500 base LP.
The rarest one would be a very rare curio that is also very good. For example an Amber Frozen Ant Queen would have around 30,000 base LP, 100 XP cost, and maybe 10 - 20 mental weight at q10. The study time would be around 12h. To balance all that out, it would have around maybe 1 - 3% chance of getting, making it a sought after curio. There would maybe be a lot of trading between villages to obtain this curio. Maybe if you have very high stats at q200 the base LP would raise to 50,000, with 10 - 15 mental weight. The XP cost being something like 200, since the study time would be only 24 hrs. The medicine mentioned earlier would maybe be Amber Extract, which would be made at a boiling cauldron, and must be stored in a jar or something. The outcome would be Amber Extract, and also the ant that was previously frozen in the amber. For example if you make Amber extract you would get Ant Soldiers if you made the extract for Amber Frozen Ant Soldiers. Also there would be another curio you can get when making Amber Extract named Amber Covered Ant (depending on the type of ant that was previously frozen it would be that type) You would be able to eat it for a boost to constitution and strength.