Recipes are found by playing mini-games. They will drop in stacks of 5, and they can be used to create different wares for your shop during a crafting session. Each recipe requires a specific number of resources that are constant, so memorization of recipes will aid in crafting.
Certain types of recipes will drop more in certain types of games.
Holiday recipes are released during holidays, and they allow players to craft special wares that are available for a limited time. Holiday wares take less resources to craft and sell for more triads than an average wares.