I'm doing a writing exercise this month - offline - in a journal/smash book sort of format. The prompts originated on the write alm blog. I wouldn't have known about it without a tip from this blog, My Sister's Knitter.
I'm not taking it too seriously, like panicking at the sight of a blank page. It works better for me when I interpret the prompts loosely and so far, I am keeping up. I haven't had to resort to a limerick yet, but I'm willing to if necessary.
Three good books about writing:
1. Elmore Leonard's 10 Rules of Writing
2. Stephen King - On Writing: A Memoir of the Craft
3. Anne Lamott - Bird by Bird: Some Instructions on Writing and Life