Here are two experiments I’ve tried to make an icy blend.  I used these for the snowflake cane in the January 2015 issue of Cane Builder.

First I just used Premo brand ultramarine and white.  This made the lower set of blocks that I’m holding.

I wanted the blend to be a little brighter, so the next time I inserted a curved section of turquoise.  This makes the top set of blocks.