There is absolutely nothing wrong with sitting on the couch and staring at your own reflection in the fireplace glass.
It is okay to do nothing and wait for flashes of genius to strike you.
They may also hit you when you are sitting in a traffic jam. So, please, always listen to those unexpected visits from the muse and keep a notepad and a pen handy.
Collect all those nuggets of inspiration and expand on them when you can.