I can't help much in the X2 department since my stores of that colorant are thin, but if you have the regular colorant I can. I am a sucker for natural baits and feel that between smokes and baby bass color a guy can create forever.
If you have a smoke that you like, thin it out a bit and use a drop at a time of the baby bass, mixing well and heating again after each drop. Go easy because baby bass is a strong color. Some green hi lite helps a lot too, but go very sparse on it because it can overwhelm the color. All you want is a smidge to give the color an internal character and some light reflection. I do not use any pearl for making natural colors like this because they tend to kill the transparency that I am trying to maintain.
One other colorant that gets sidelined when it comes to the natural looks is amber. Amber is another strong color so small additions do you justice. Do a plain smoke and tone it a wee bit with amber will give you an uncanny back color, especially if you tap a light dusting of gold hi lites in the mix....only a dusting though.
Once you have a baisc color made up you can add tiny amounts of blue or violet hilites to a plain smoke along with some small amount of the same color of small flaked glitter. Doing so gives the bait a realistic look. At first glance you don't notice much but turn the bait in the light and you'll see the same natural color shifts happening with your plastic as what happens in nature.
