Crafting Decor

Hey I just wanted to ask, which interactions from Explore get you crafting recipes? Besides the newest ones released, I have all the main ones from the Raccoon. 

How do you get the rock foreground ones, the fallen tree, mossy stuff, & arnica flower crown? Different NPC or am I just not lucky? 

You find them! You generally find them in explore encounters, in place of what you use to make them - for instance, the rock foreground recipe requires large rocks, and you can get it from various encounters that usually give large rocks or other cave materials. This guide shows what's needed for each recipe and where you can get it (except for the very new ones which aren't known yet). Some are much easier to find than others - I have all the old acorn recipes from trading with the opossum, but I'm still missing many of the others. 

For the arnica flower crown recipe, you can find it from your herbalist while they foraging, I have the recipe, if you want one you can send 5 arnicas to me and I will return it as the decor!

(bad english, sorry)