Pick an evening sometime this week. Tell people you're not going to be available. Ask your SO to go out with friends or something. I'd grab a quick bite after work, go home to an empty apartment. Close the blinds, dim the lights. Turn off my cell phone, turn off the wifi on my laptop. Put on a playlist of music that puts me in a good, happy, mellow mood. Poor myself a glass of wine, and settle down in front of the computer.
And just program. Don't worry about getting the code just right. Don't worry about business logic, unit tests, or what might happen if the user clicks the wrong thing at the wrong time. Just program. Make the computer do something cool, just because you can.
Who cares if it won't scale? Who cares if there's no business use case? Who cares if people won't pay for it?
Forget all that. That's work. You won't be able to program after work if you make it work. It has to be different. It has to be fun.