The revival of Transparent AB sequins as seen in some of the latest beading work by Pepari and Noramanik. I think they want some diversion from the favorites susu/pastel colored sequins used by most of the beaders. Transparent AB creates a "barely there" effect if used sparingly, but can turned into a dazzling and stunning flowers.
Try to experiment with layering 4mm susu/pastel or metallic sequins inside and see the different finish of the flowers.
Example of beading works using Transparent AB sequins by these much admired beaders:
Pepari: http://peparidsign.fotopages.com/?entry=1864171 Noramanik: http://noramanik.fotopages.com/?entry=1864333 (the purple flower)