I use Createx. What colors do I mix to get the blush color you see on the bottom of some lures like Lucky Craft.

are you talking about the pearlish white/tan color? I also use createx and I normally mix opaque white with pearl white with a few drops of light brown usually make a nice bottom color. But to tell you the truth its all just experimenting with mixes...

Like Jacobhookem said, just mix.  I can't afford to buy a bunch of different colors so I mix a lot of mine.  Just keep mixing til you get what you want.