You can do a heck of a lot with Electric Image, which is mainly a mac platform, though it is ported for PC. You'll need amorphium to convert the EI models to obj, etc, and Amorphium is handy for organic type f/x tools. The real deal is at www.universe3d.com and the older version which is nearly the same modeler as the current is way cheap at www.dvgarage.com I have an interface screenshot at www.annsartgallery.com/ei.html