Recently I presented such a kind of wall decoration already, but there wrapped with patterned paper, large-sized photos or fabric.
I find these silhouet leaves pictures almost more beautiful :)
Links:
Wall Decoration with Silhouet Leaves (Іванна Синюк – Алена Животова) (Russian)
via: Sherry Saville via Sherri Anderson
Here at unikatissima:
Styrofoam Wall Art