Get a cheap-ass point and shoot digital camera and carry it with you at all times when you don't have a real camera.
Throw it in the glove compartment of your car, keep it in your knapsack or your coat pocket. If you have an iPhone, use that.
Whenever the creative spirit hits you, snap a digipic. When you get home, download the pictures and look at them. When you see them on the screen, decide if they are really what you wanted. If they are, pick an appropriate day and time to go back and shoot with a real camera.
Back in the day, lots of pros and serious amateurs carried instamatics, Polaroids or single-use, disposable cameras to do the same thing. Now you can do the same thing with a digicam.
Nobody said digicams weren't good for anything. Just not for serious pictures.