Hi Lara, yes things that are more organic shapes with a kind of melty lumpy type form are not really very suitable for modeling in MoI. MoI is primarily focused on creating models by construction from 2D profile curves and it's difficult to create such forms from profile curves alone. Sculpting software such as 3D-Coat, ZBrush or Sculptris may be some good ones to try for organic shapes with bumps and ridges in them.

- Michael