We'll be modeling the Jack-o-Lantern below, as it combines spherical geometries with smooth planes (I'll go into detail later). I started this project when I saw the Jack-o-Lantern contest on the website. I had never done any organic shapes to this extent, but through either blind intuition or a whisper from the Lord, I found an approach that was malleable enough for organics, but geometric in nature. This process allows you have the freedom of organics, but with the straight-forwardness of geometric modeling.
I'll be using be using Blender 2.68a for this tutorial, but since it is mostly a concept tutorial, this should work for most 3D modeling/CAD softwares. Let's Begin!