Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Emotional Blocks

Emotional blocks can affect our ability to communicate our creative ideas to others. One of these emotional blocks is a fear of taking risks [ For more on 'fear of taking risks' go here: http://www.braingle.com/mind/225.html ] and making a mistake. Another block is the predilection to judge ideas prematurely. This is why deferring judgment [ For more on 'deferring judgment' go here: http://www.braingle.com/mind/85.html ] is a strategy used by creative people.

Another emotional block is the inability to tolerate chaos or ambiguity. New ideas are by nature not perfect. They are going to be rough around the edges and may have conflicting points. Through an iterative refinement process, you will be able to resolve these ambiguities.

The lack of a challenge can also be an emotional block. If you are not challenged, then you are not going to be interested in the outcome and it is unlikely that you will be able to put a lot of creative energy into new and interesting ideas. Picking problems that interest you, or finding ways to add excitement to uninteresting problems will help.
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For more mind exercises: http://www.braingle.com/mind/