Here's a new tutorial I've been working on. (Thanks, Frit Diva, for the reminder to put it here!)
This tutorial shows you how to get a veining effect from just one glass color. And you'll get all the information from my glass testing - what colors work great, what colors just wouldn't cooperate, and what colors work but take a little extra coaxing.
The tutorial is $25 and available in my Etsy shop:
https://www.etsy.com/listing/1869118...op_home_feat_4
And check out my blog post for a coupon code of 20% off ($5 value), good through May 5, 2014.