I am working on a “Pen” mod for a game i like.
I am using trails to draw and my problem is that when i swap colors the trails color also changes 
My ideas to this problem would be to have multiple pens or multiple pen tips i would swap out when i choose a color but that sounds like there would be a better way of doing it. Any ideas?
My Problem:
Well - you haven’t shared your code - but I would guess you are probably using a single shared Material reference for your all of your LineRenderer/TrailRenderers. One quick solution here would be to create a new copy of the material for each new LineRenderer. This can be done simply with:
Material matCopy = new Material(originalMaterial);
Then you can simply use matCopy for the new Renderer.