Adorable plates for brothers and sisters. Coordinate accordingly! Adorable for snacks or cupcakes. No kids? Hang together on a wall! That's what I would do!
Check out the coordinating listings for pink and powder blue.
Attracting new email subscriptions is a great use for a popup, but you can also use it for other purposes, like an 'agree-to-terms' entry point, or to link directly to pages and products in your shop.