For my Druid Outlander, he plays Pan Pipes, and I chose his background's 'trinket' to be a set of bone pipes made from his first kill.
He tarted it up a bit with some feathers and stuff to be a Totem. It sits around his neck.
So, when he replaces a material component (which isn't always), I flavor it as he just picks it up to his face a bit, and blows a few notes on the pipes - usually the theme to the Good, Bad, and the Ugly.