How do people get their Cephs into a "mound" like that? Most pics I see of folks' Cephs, they're all mounded. Or, is that the natural shape of the crowning on the plant?
Depends on the plant you have--most have a tendency to grow vertical.
It also depends on the pot you have--larger pots promote more horizontal growth, sometimes by underground "runners." Smaller pots tend to promote more vertical growth.
At least that's what I've noticed with mine....