The butterflies are made with stamps from the Pick of the Bunch range. and are stamped in clear ink with clear embossing powder. This then resists the watercolour paint.
The butterflies are mounted on strips of acetate allowing them to flutter when the card is taken out of the envelope and giving the recipient a lovely surprise. (It is a bit of a juggle getting it in the envelope so make sure you have signed the inside first before attempting to cajole it into the envelope).
The sentiment is my own digistamp mounted on an oval cut out with the Shape Mate.