Current Colors-
Blue/Pink
Green/Cyan
Pink
Purple
Gold
neon green
Orange

Planned Colors
Red
Light Blue

Cycling colors would be exceptional, if it's feasible - I am imagining something akin to the dye system, with rainbow cycle, red and black cycle, wavy or VHS shaders you get from lunar tier dyes, that sort of thing.

Even if not, a variety of simple two-or-three color mixes that can be crafted and equipped would add a lot of distinctiveness for the player, and simple content to bulk up the mod's experience. I'm not usually the sort of person who cares to find kelp for green dye for my armor. but I WOULD do it for a dark green and copper mix flamethrower blaze...

Edit: Further, dials for reducing or increasing particle size, particle shapes, particle variety, and opacity could add a substantial amount of expressiveness, without demanding a lot of mechanical distinctions between weapons. And, hell, there are surely times I'd love to have MORE visibility, but other times I want to revel in my screen-blasting gpu killer because, yeah, it's a FLAMETHROWER. That's why they're /awesome/.

I want to do something like that but that seems a little advanced for me, and I don't know how I would add a way to change colors or dye effects/Shaders.

idea: rainbow gel.
basically just adds a rainbow tint to the flames, except its rare and does a lot of extra damage for your troubles.