Livery buttons often had family crests & were worn by menservants of the 18th and 19th century. Most of those pictured here were made by Firmin & Sons, London.
Porcelain stud buttons were often sold blank & ladies could paint them at home to wear & exchange with friends.
A couple of interesting buttons with inanimate objects that have crossed paths with me recently. An artist palette, 3D dice, an enamel button with a vase & cut steel nails over faux wood planks.
Salesman's cards would often have variations of the same button for buyers to choose from. These black glass buttons have differing tints.