spawn towards nearest particle possible?

[joe_coke]

I've got 10000 particles scattered on a torus surface.  I want to grow splines to join the paricles, however i want to start from 1 particle (or some random ones) and i thought spawning via travel distance from this origin to its neighbours (based on a distance threshold).  Is this possible?  I intend to spawn from these neighbour particles outwards etc until the torus is covered.

I have tried flocking with rubbish results.