https://www.ringofbrodgar.com/wiki/CuriosityEvery world I sort this by LP/hr/Weight. Anything that's 40+ (after quality modifier) is a prime candidate.
Here's a list from those curios that have 1hr+ runtime (or should, mighta missed one) and are reasonably accessible in the new world. I'll star the ones that I often rely on. Some of these have techniques required to get them efficiently, not included.
*bat wings
*enthroned toad
bark boat (tedious, I don't often bother)
frogspawn
washed up bladderwrack
poppycaps
*royal toadstool
tangled bramble
*jellyfish (my guilty pleasure even into mid world)
bloated bolete
*water strider
ladybug
*feather trinket
worm eaten apple
*gooseneck barnacle
dewy lady's mantle
stalagoom
*mirkwood offering
thorny thistle
auroch hair
flotsam
*dragonfly
ant queen/empress
Ultimately pumping int to make less efficient/int but more LP/hour curios accessible is the key to snowballing your LP.