Together with Florian Westreicher we built a timer for the then emerging virtual reality game Ingress. As I had close to no experience with coding back then, my part was pretty much solely to create the used images of the app. Since the app was quickly built, over the course of a weekend or so, most buttons were open source materials. The icon of the app draws inspiration from the Ingress icon as it was then but also clearly shows its kinship with time.
The 2 button icons that had to be specially made were a hide icon and a burnout icon. They are simple in design and try to relay as much information as possible. For people that played the game it was quite obvious what the buttons did.
Since the buttons are very small they are also quite low in resolution, though it is still gigantic for a few milimeters big icon on the screen of a smartphone.