I was asked to do a card or cards to choose from, for a specific person from the Geological Society. This person has published and hand-illustrated books about the shells of New Zealand, and has studied ostracoda (minute marine shelled organisms). I ended up with 3 designs that I liked and also made up a tangle while I was at it (to be posted here soon!) See top right of middle card.
The card that was chosen was the first in line, with the inside of the shell filled in with Zentangle IA.
Update: I have learned that the recipient liked the card (the filled in shape was chosen) so much that she had it framed!