Certain projects require the stately look and feel of Vellum. This A4 sheet of Printed Vellum with its repeated White Swirl Pattern has all kinds of Craft uses and would be especially good used on Aperture Cards to accentuate the Window in the Card. Vellum is semi Translucent unlike ordinary paper so will show some Light through which would add to the enhancement of the Design. 

A4 Printed Vellum - White Swirls Pattern