Best ways to change ballast colour

[RobertInOntario]

I've just started tinkering with a small layout. I'm almost done laying the track (I have to tweak it a bit).

I realize that I should change the colour of my ballast to suit the prototype. I believe ballast colour of the area that I'm modeling (the Somerset & Dorset Line in SW England) was a brown/pink. Before I start ballasting, I thought I should try to change the colour of my ballast and was wondering what was the best way for doing this.

I currently have some Woodland Scenics grey ballast. It works well but, after applied, appears far too clean and white-ish for a steam-era railway. Should I mix ballast of another colour with this?

Thanks,
Rob