One of the mod authors whose mods you really enjoy not only grants you permission to use their assets in one of your mods, but also let’s you know they’re excited to use some of your mods in their next Fallout 4 run 
This made me happy, because my mods are usually simple in their scope, a new house here, ammo availability there, and a crazy ass merchant in the middle of an irradiated wasteland full of Deathclaws and Radscorptions.