Being an ex-scrapbooker I had an abundance of beads and because I have always loved typewriters, I had many vintage inspired typewriter key beads, which I gave to my customers as an "extra". Now, I am running low on those and I have moved to giving vintage buttons to my customers. I hope they enjoy.
I also always wonder what types of "extras" other vintage Etsy sellers give away. As a vintage buyer, I always appreciate the little touches from sellers, even it it's a simple thank you note.