Patrick, I like the bills pictured in your post. They contain no symbols of our national government, no references to our religious traditions, and no winks at Masonic hokum. This intentionally post-everything design would put Robert Langdon out of work.
Most significantly, this tossing off of the older values and their symbols does leave one symbol in place: the dollar sign. Ah, triumph of capitalism. Who needs “In God We Trust” (let alone cyclopic pyramids) when we have the one symbol that really matters?