I am living the nomad life at the moment, so I mainly study whatever curios I have at hand. ATM I have collected a huge amount of Frog crowns, so I am looking for a swamp to get some toadstools, but that's generally not the norm.
In civilization, though, I take the highest LP per hour that I know of and can make (bronze steeds, flower bouquets, sandcastle sometimes), then pile on some low attention, high LP at a slow rate ones (aurochs hair, petrified shells) or I chainsmoke mirkwood offerings (which are still pretty good despite nerfing).
I'm pretty nooby, so don't take my word that those are good curios. (Except the mirkwood,
which was confirmed one to be pretty badass.)