Acknowledgement Cards Acknowledgement cards are a completely personal choice and can be plain and elegant, colourful and outgoing or tailored to reflect a special time or place. Just tell us whether you would like to use one of our images or supply your own. The cards are approximately 133mm x 90mm, produced on high quality white board and are supplied in white envelopes. The back of the card is plain leaving room for your personal message. * The quality of the finished cards depends on the quality of photographs, etc provided.