sculpted trees

So far I've been making trees with sculpted trunks and cardboard cut crowns.
I saw trees with single sculpt crowns, but I am wondering how its done.
The crowns look like they have intersected planes but still are a single sculpt.

I took a hollow cylinder and made it into star shape seen from above, but that's not really it.
Any tips on how to texture such complex shapes are welcome too.
Or am I asking for some trade secrets here?
Could anyone point me to some tutorials or tips? I did search the forum for sculpted trees.

Btw I am learning Blender but mainly use Wings3D

Thanks ,

One thing you need to know about sculpted prims is that zero-sized faces are not rendered. This means you can visually "cut" a sculptie into separate parts simply by scaling down edge loops to a single point. The parts will still be connected, but the connection will be invisible (except in wireframe mode). Combine this with the option of making a 4x256-faces oblong sculptie, and you'll have plenty of ways to model trees and plants.