There's a lot of things you can put into pepper mills.
Although I have quite a collection, I usually just fill my pepper mills with white and black pepper. That's two different pepper mills ...
... sometimes, though, I mix all the various round seeds off my spice shelf and throw that into one or the other peppermill. That makes for a more interesting taste:
And I forgot all about chasteberry or monk's pepper (Vitex agnus-castus), cos that one is not on my spice shelf. Thus there's no photo of that one, sorry.
And a search of my site for "pepper" gives lots and lots of peppers which I don't have yet ...
... hint, hint.