Watercolor Card Redux

I took the one-layer card from my last post and made it into a layered card after trying to iron it flat.  Next time I use this technique, I'll tape it down before I start.  And how could I not do another?  I love how the colors mix and change as you layer.

The black edge really pulls the card together, doesn't it?  I wonder if I looked back at my cards, would black be my most used card base besides white?