Here is a link to our gallery. We have two images on that page of a black epoxy floor with an epoxy clear coat.
Dark colors can look nice. However, you need to be aware that dark colors will show every bit of dust, dirt, footprints, and tire prints. They also highlight any small scratches that may occur. It cleans off easily, but it's a regular chore to keep it looking nice. It's why the metallic garage floor coating craze died down. People found it always looked dirty and highlighted too many micro scratches.
That is why lighter grays and tans are the go-to colors in garages. They do a much better job of hiding the dust and small scratches.