Filling object with Splines

[Eoin Edward]

Hi - I am trying to create a model as seen in the first image below. 

I have created something similar (the second image below) but in my version the splines are too straight and I am not achieving the curved and convoluted path of the splines as in the first image. Also there are a lot of intersections/collisions happening.

In my attempt, I used:

Position object (Location: Volume)
Object Bind (Lock to Surface)
Speed (Random 3D)
Spline Paths







Is there a way to make the path of the splines more organic? I tried adding a Wobble attribute but it did not work.

I really appreciate any help you can provide.

Eoin