Hi, if you look up LABrashear, she shares a great hub reviewing 3 AM Epiphany by Brian Kiteley. After reading her work, I started doing the challenge as well. The book includes writing challenges that really make you think outside your normal writing. While it doesn't provide "topics" it provides the challenges that will help you write.
Another way I come up with topics is to think about what I know and then write about them. I have hubs that are unpublished because I started them and lost momentum or ones I think will be good one day. I also love to hop hubs. You may see a topic that you may be able to cover from another angle.
Good luck overcoming your cramp.