Here are some links to interesting articles about how to stimulate creative thinking:
How to Increase Your Creativity
Give Yourself a Whack on the Side of the Head
Top Ten Ways to Increase Your Creativity
Seven Steps to Increase Your Creativity
My favorite tips from these articles:
"Take a nap."
"Take a break and go for a walk."
"The more often you do something in the same way, the more difficult it is to think about doing it in any other way. Break out of this "prison of familiarity" by disrupting your [habits]."
"Encourage really, really bad ideas: If you are only coming up with good ideas you aren’t being creative... Bad ideas often lead to really great ideas."
What are YOUR favorite ways to get through creative blocks?