Fouquet and Lalique were the masters of Art Nouveau. This pendant is a fine example of the style he introduced as a complete breakthrough after Belle Epoque. An organic design with different opal stones that create an almost translucent effect.
New contemporary painting: Yago Hortal Painting style - drop splashes of paint then drag brush through it. This is gorgeous. I won't have brushed big enough to do this, but you could pick up a giant sponge brush at the craft store for pretty cheap