Pull linen taut around front and sides of board, and staple it to back, securing two opposite sides first, then the other two.
Be creative in arranging ribbons in a pattern on the surface. (The pattern at left is modeled after a garden trellis.) Use upholstery tacks to secure ribbons. Tuck your cards behind the ribbon; you'll need few, if any pushpins.
Screw a picture hanger to the back, and hang the board on the wall.