TIP! You can add CP's to the control grid by cloning existing CP's. Those new CP's can then be used as ankers to further deform the mesh with increased detail. With the vase for example, we could have added a wave-like contour to the top of the vase, as you see with some lamps available today. Note though that if you add more CP's than there are Edges or Vertexes opposit of it, it won't further affect the area.

SketchyFFD plus animated examples are available here.

Conclusion

I hope you enjoyed reading this article and I hope you start using these plug-ins because they are very useful!
With the exception of Subdivide and Smooth, all plug-ins are free also.