They probably would look like these images that came up when I googled mini Zantedeschia:
https://www.google.com/search?...
They look like the regular callas, just smaller. I don't know if anyone on this forum is growing them; I have grown the larger ones. Three inches deep might be a little too deep but I really can't say for sure. You might try posting on the bulb forum here and see if anyone is growing them. This forum is for the genus Lilium while the bulb forum covers many of the lesser grown bulbs.
http://garden.org/forums/view/...
I hope they do well for you, I do love callas!
