I did an experiment with Pearl Ex pigments and Valejjo pearl medium. I wanted to see, if I will get lacing effect with this mixture, and I did. Maybe I have to mix it a little bit thicker, but otherwise I'm happy.
It doesn't show on video, how shimmery this is, but I will show you dried result on daylight in one of my next videos. ;) 
I have a lot of beautiful ColorArte pigments too, so I really want to see, if I can mix my own pearl colours to get some beautiful lacing with. 
https://youtu.be/tjHfKi5wpLU
How I mix my pouring medium:
https://youtu.be/ltyiLgQ_Tso