I collect arrows. No, not the kind with feather fletching that archers launch from bows. I collect images of arrows, mainly those painted on pavement. I guess I have hundreds of them, but sadly they’re scattered all over the place because I didn’t realize I was collecting them until a couple years ago.
The double arrow above was captured with an Olympus Pen E-P1.
You should collect something. Flags. Dogs. Parking meters. It’s helpful and productive for photographers to work within a theme or self-assignment.