I love playing with spell ingredients and custom inventory so much, It’s such a nice little storytelling tool for the character. In our Wild Beyond the Witchlight campaign Victoro (who recently found a new Deity to follow after he got dumped by Asmo during his Waterdeep shenanigans) has began crafting new Divine / Arcane Focus from the items he’s hoarding during his travels.
A staff made of feywild wood, with a rusty sickle blackened by Inflict Wounds used to kill it’s previous owner (Inflict Wounds spell for him comes from the Shadowtouched Feat which is directly connected to his new Deity so a neat little flavour coincidence here), tied together with a Thread of Frustration and Self Doubt taken from a Detached Shadow, with a glass eye stolen from a Witch floating in the middle of the sickle. The glass eye is Victoro’s Divination focus and spell component and works as his ‘third eye’, its iris is completely colourless since Victoro sold the colour of his eyes to a Fey merchant.
Anyway, I’m planning to gradually make a proper creepy magic item out of this during our campaign, and ofc draw it, but I am super happy how it comes together so naturally through the course of our adventures.