We’re amid a cocktail bitters revival, of course, but what's missing? This: modern makers of bitters haven't caught up in the bottle department. At left is an image clipped from a 1922 edition of the magazine Antiques, depicting bitters bottles from the 1860s.
On the far left is an Indian princess with Brown's Celebrated Indian Herb Bitters. Third from the left is Dr. Fisch's Bitters, which may not comes as a surprise. The other bottles, or “freak flasks” as they're referred to in the article, are shaped like log cabins, a corn cob, and a "Toby," or one of those mugs modeled after a sodden man wearing a tri-cornered hat.
Aside from the fine quirkiness, think how much easier it would be for bartenders to grab the bitters they need at a glance rather than hunching over and squinting at all those identically labeled eye-dropper bottles on the rack. Bring 'em back!