I really think that current (cvs) curve modifiers are now extremely valuable tool for modelling.
I made some test. These kind of forms are quite difficult to model with traditional lowpoly-tools.
The plane on the left is the original mesh and after 3 curve modifiers and 1 lattice it is formed like seen in the right.
If anyone is interested, I can make a small tutorial about method. (after weekend that is).
We have so great software here!!