Lynne Hackles' Writing from Life: How to Turn your Personal Experience into Profitable Prose is one of the best books I've read about writing. It's about using your own experiences to write fiction and non-fiction and how even trivial experiences can be turned into articles or stories which can make you money.
It's a case of thinking laterally and adding and subtracting bits and pieces. If your washing machine breaks down and you have to wait ages for it to be repaired turn your angst into a short story or an article for a magazine about how to complain successfully. The author describes how she makes use of snippets from other people's conversations, overheard remarks, childhood experiences - your own or your children's - teachers, jobs you've had however mundane and unpleasant or sad events.
I loved it and it certainly got me thinking of loads of things to write about both fiction and non fiction. It would be of use to both experienced and beginning writers.