Klaus, in Lemony Snicket's A Series of Unfortunate Events, keep a little notebook which he calls his Commonplace Book. He uses this Commonplace Book as a place to keep little scraps of observations or information which he thinks are interesting or important during his adventures.
If I were Klaus, I would fill my Commonplace Book with observations, and sentences or phrases that I make up, or words that I don't know but love the sound of. This sounded like such a lovely idea to me that I decided to start one. I have a little notebook with a coral-pink leather cover that fits into the palm of my hand. I am going to try and take it with me where ever I go... within reason... so that I can keep my spontaneous thoughts forever.