Black calla’s seeds?
Inside the bloom there appears to be multiple light green seed pods. Is this right? Can they be saved and planted? If so, how will I know when to plant them? Or am I just whistling in the wind? Where can I order an assortment of colors?
You can propagate from seed, but it is best to wait until they dry in their pod on the stalk. As far as ordering, you will have to check local nurseries, or online gardening centers.
This article will give you more information: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/calla-lily-seed-info.htm