Bluebell Petal Background Sheets (approx. 5 x 7 inches): 150-200 gsm stock 100% recycled white cotton processed chlorine free Handmade cards are embedded with real blue cornflower and grass they will vary in thickness and petal arrangement and color. Background cards are used for our unique layered invitations. A printed overlay embellishment and envelope is required to complete the look. Click to view complete list of blank invitation supplies.