According to a delightful entry in the book I Like Your Work: Art and Etiquette, one often-successful conversational gambit in artist-to-artist scenarios is gentle conversation about other artists, preferably ones safely not present.
On the internet, one can never be too safe. So, the criteria morphs to a more restrictive subset: those excellent artists in any medium, now deceased. Older may mean safer, but landmines persist: be careful out there, the road from A to Z can be trecherous. For a bit of added nuance, architects, type designers, etc. are also allowed if those playing the game are so inclined or wish to make an inclusive statement.
Apparently, it is customary to start with the first letter of the alphabet. As such, and without further delay:
Audubon, John James
Bravo, Manuel Álvarez
da Vinci, Leonardo
Moore, Charles Lee
Siqueiros, David Alfaro
Talbot, William Fox
Wright, Frank Loyd
(Off the internet, on rare occasion, there is another overlay.)