Curved Board for Simple Top Treatment

The curved ends on the boards really adds something to these simple interlined embroidered silk kick-pleated valances.
Although what exactly the curve adds, I can't put my finger on.  Perhaps it doesn't so much add, as subtract- it keeps the treatments from looking hulking by reducing bulk? 

The narrow windows take on more substance with the treatments extending out about 6" on each side, but since they're close together, the curved board keeps them from looking like they're bumping into each other.  I love these curved boards!  Now I'm thinking about other applications for the curve......