TORONTO Looking for an upscale and tactile invitation? Bella Invites recently introduced a range of cards with silk backings to its collection. In the Truffle and Blush Champagne designs, Italian shimmer card stock is mounted on a silk square, with a back pocket for directions and R.S.V.P. cards. Invitations can be customized in more than 200 colours, and include reply cards, return address labels, and padded envelopes for mailing. Prices start at $42.95 per invite, with a minimum order of 50. Allow eight weeks for production and delivery.