At the end of this article, In Praise of Resource Constraints the author quotes an old Finnish army adage:

(derived from Finland's battles against much bigger adversaries throughout the course of its history):
"If the heavy armor does not move with four people pushing it, take one man away and let us see if three can do it!"

This made me laugh and remember a quote from a blog post, What Would You Do If You Had No __? attributed to Taiichi Ohno:

"Your wits don't work until you feel the squeeze."

This matches my experience as well. But why? My theory is that unlimited resources makes it is too easy to stop asking assumption challenging questions. Without these type of questions we are not broadening our learning, we are just deepening specific knowledge or continually reaffirming what we already know or worst believe to be the case. At the beginning of one of Howard Gardner's book he relates a story about being asked if he, a professor, feared not being able to answer someone's question. No he replied, "I fear not being able to think of questions to ask".

So what are you removing to help yourself think more creatively?