Hi Renee, I wrote a hub about this last year, if you want to see: http://chrisinhawaii.hubpages.com/hub/Writers-Bloc...
I often get ideas by revisiting my old hubs and looking for ideas in there that would make good spin-off or follow-up hubs. For instance, if a hub has 5 main points, I could write an in-depth hub on each of those points and link them all together as a series.
I also will just read more, and often ideas will come to me when I read and comment on other people's work. The Hub Hopper is awesome for this.
Rambling/journaling is also great for getting the creative juices flowing again.
As a kid, whenever I felt stuck on a writing assignment, my Mom would always tell me to just start writing ANYTHING. So you could just start rambling. Write about what you did today. Write about what you wanted to do but couldn't. Write about how hungry you are right now and what kind of food you'd eat if you could have anything. Before you know it, you've "unblocked" your mind and you can get back to work more easily.
Also, just get outside and clear your head. Lately, I've been getting into knife throwing (yeah, for real). Just today, I went outside and threw for a little while. It's a great stress reliever.
Good luck =)