Currently I'm working on an app which uses a vertical 'list' of cards, somewhat like Google Now. These cards can contain static text, (small) images and some control elements (buttons etc.), or a combination of any of these.
Now some cards might contain additional information or buttons, which we want to show when a user expands the card by pulling down the bottom of the card. Similar to expanding Android notifications. However, how can we properly indicate that some cards are expandable, while others are not?
A quick mockup of the layout: