These seeds were given to me by someone who hasn't took a picture of the plant and draw it instead. It is supposed to have a white flower in the shape of a cup. Probably an annual plant in a 6b zone in Europe. The seeds have a diameter of 0.2 inch (0.5 cm).
Well, I love the plant although I only had the perennial relative. I've got a strong suspicion your seeds are from Datura innoxia or Angel's Trumpet. Belong to the same family as peppers, tomatoes and eggplants so the seeds will look similar.
Datura are annuals and the flowers point upwards (hence angel's trumpet) while closely related Brugmansia are perennial and the flowers hang down. Both are very fragrant, all the more so in the evening!
They are poisonous but then so are a great number of beloved garden plants. Just use caution if you think any pets or small children might try eating them - which I think is highly unlikely! Datura innoxia seeds