I'm sure many of you have eyeballed lots of model railroad roadbed. I'm ballasting a bunch of yard and mainline track and want to make a good choice for the color of ballast I use. The track is all Atlas code 100 flex that has been weathered a flat, dark brown. I would love to ballast my track like the local purple-ish granite used by CNW but have found nothing similar. So I'm willing to give up prototype accuracy for what just plain looks the best - makes the track look more real, is pleasing to the eye, etc., etc. Any suggestions? Pictures to support your opinions would be greatly appreciated as well.