Yeah I agree about the uneven glaze looking better. As with gemstone, the ones with imperfections under the surface end up far more interesting and rare.
Mint is ridiculously easy to transplant and propagate from cutting, yet notoriously challenging to grow from seed. Seeds do not stay viable for long, and the young roots need perfect balance of airflow, moisture, and temperature. I would probably try to start them outdoors in summer shade, or in a greenhouse.
If you can ever find some wild mint growing near the sidewalk, rip a few stems off and the neighbor will probably thank you if they even notice. Farmer's markets and plant stores often sell inexpensive starter plants too.
It really isn't even worth the cost of seeds and soil, unless you have a diehard life goal to prove you can do it for yourself. 😪