I'm thinking she'll probably end up getting a photo of her, her mom, Luke, and Simon (her family, basically) so Kol could get that if you want? It could be bundled with some lingerie or undergarments as well.

Sounds good to me! Clary wouldn't spread the word unless she knew Kol was planning on straight-up killing people or something. But she'll be very adamant about him only feeding from willing people after she figures it out. And will probably be very grumpy at him.