Mermaids under the sea C6 gatefold card - no message (11 ratings) Mermaids under the sea C6 gatefold card - no message (with envelope) £2.25 Quantity: at £2.25 each Add To Basket 2 in stock. This is a hand coloured C6 gatefold white card which has an underwater theme to it with mermaids on both sides of the card. The background has been "painted" by myself with Nuvo drops as the bubbles. It will be cello wrapped and sent in a board backed envelope by 1st Class UK post which is included in the price. Please note:- Each card is hand made and therefore might vary slightly to the one shown in the photo.