Cool result Phiro

For an ultima perfect result the "boundaring tube" should be also a little perturbated! ;)

@Tony

I believe that you must maybe have the same number of "Points" when you "Rebuild" your curve(s)

Like this even each curve is tortured crease will be more aligned and less disparated than in your case!

PS The distort curves thread by Max Smirnov
http://moi3d.com/forum/index.php?webtag=MOI&msg=6659.13

Else Blend method from a Subdivided box



For make a Blend each edges selected must be belong to a surface!
(so some tricky process :)!