Here's a Blender file that shows you how to section a model by using Boolean modifiers, like I did to make the 'Exploded T-Rex skull'. There are many ways to do this, but I keep going back to Blender for these kinds of tasks. Once you get through the initial learning curve, it is really easy and fun.
Also, find some large T-rex teeth made from the T-Rex skull using this technique. These could be re-purposed for sculpting a Tusken rucksack from Star Wars Galaxies, for example.