Sea glass Blue-Green 5×7 Cardstock for Invitations (5.125 x 7 inches): solid color with tiny fibers 80# heavyweight cover 30% recycled content acid free elemental chlorine free FSC certified Green Seal certified. A soft muted light blue-green 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.