Kept busy all the morning with searching something for this exceptional topic, it seems almost impossible to make up something new on hundreds of thousands designs since last milleniums. OK, 200 years, we agreed on milled.
Conventional motifs are likely dried up, especially if we consider same genus of animals/species. Who cares if it's Grizzli or Polar bear... Well, lemon vs orange are OK in my opinion to be different as they're every-day fruits.
What I found is maybe already not unique, but couldn't find any other coin with ASCII image
Netherlands 5 euros 2008
If same thing doesn't exist already, it will surely be made soon.