So, the Mirkwood Offering got me thinking.
What if we had a variety of offerings with small benefits afforded by them while they're being studied? Mirkwood Offerings might provide a small boost to Exploration, or reduce chance of aggro by woodland animals while being studied. Another one might be themed after the underground- crafted with entrails, one of any combination of two stone and ore, and a cavebulb- giving a small boost to strength or providing night vision (or maybe preventing bat aggro). An offering themed after plains and grassland would use appropriate ingredients and could allow the player to use higher movement speeds with less of a stamina drain during the study period, or some other thematically fitting effect. One for lakes and rivers would use clay and fish bits, maybe giving a bump to boat speed or increasing catch rate while fishing. The list could go on, with offerings relevant to many aspects of life in the Hearthlands, though for the sake of your own sanity maybe limit it to 9-10 different ones.
It would be a cool and significant method of increasing the variety of ability between players in relatively unique and accessible ways, but at the cost of experience. Some non-curio offerings may give much more potent and even semi-permanent benefits, but with very significant material and experience cost, and the sacrifice of a study square while you wish to maintain the benefit, as with the Bond of Blood and Soil.