This card is made using some of the new smooch inks (you can find the details for them over on the Do Crafts website).
All you need to do is spritz some card with the inks and let it dry.
Turn your card over and draw a triangle onto it.
When you cut out the triangle you cut it into pieces with irregular edges.
(I'll be back on later with some step by step pictures for this).
Layered onto black card, I think it looks very effective.