I discovered that plasticised wrapping paper is fairly good fold-wise, but wants to unfold itself, so I fixed it together with sticky-dots and pressed it flat before attaching it to the card. Difficult to do in secret also it turned out.
I have seen a lot of smaller models that would look great on a card, and it seems there is a movement in the origami community that specialises in just such models.
This fold is taken from “More Origami” by Robert Harbin and is a nice variation of the stretched bird base.
Candle-lit dinner to follow, nice. Happy Anniversary Jo xoxoxo