I love the entire idea of modeling with implicit surfaces. Instead of building things in computer graphics piece by piece, you can describe many organic looking shapes just by blending together simpler shapes.
Just for fun, I put together a simple demo of this. Behind the scenes it is actually a blend of three simple ellipsoids, but what you end up seeing is an organic and ever changing shape that feels like some sort of living creature.
Just one of the many reasons that I love computer graphics.