Quote - > Quote - I'd like to vary the width of the streaks and do this somewhat randomly.

A paint program perhaps?  PSP or PS.

 

Judging by the set up of that map, I don't think it would be easy to do it procedurally.  Particularly if you want any fine or specific deatils.

I have tried a paint program to produce the streaks, but everytime I wanted to vary some part of the pattern, I had to draw a new one. Since it's just vertical or horizontal streaks, I had hoped it could be set up in the material room, but perhaps not.