Native American
Native American, or Tribal plates have sprouted up in some states. Oklahoma has offered many; of these the Cherokee Nation is the most common, especially because it is now available to non-tribal members.
These five show different styles and graphics.
Ethnicity
I was delighted to find this one at ALPCA’s convention in Valley Forge, since I am Italian-American.
Other
Colorado also has an unusual specialty tied to history and culture. The “Pioneers” plate was initially available strictly to descendants of a relative who lived in the state 100 years ago. Now it is available to all motorists willing to pay the specialty fee.
The Nevada Citizenship Project provides naturalization resources to Silver State residents. It was started in 2001, and four years later they had a specialty plate.