When a challenge presents itself to be met make a commitment to meet it and you will usually come out ahead. You will definitely learn something every time. Go for a walk around the block, get in a cat nap, play a video game. You will find that this is when the creative ideas frequently present themselves not when you are at your desk laboring for them to come. There is plenty of room for fun in your workday.
Meetings are a great place to start.
As a success coach I hear complaints all the time about how boring meetings are, how they drag on, how they put people to sleep. Never have a meeting if you are not going to bring in some fun. Try balloons or hats or huge pencils for everyone around the table. When you begin your commitment to creativity you must also anticipate positive results and know that your creativity will bring you many rewards. Creativity is what separates those professionals that just survive from those that thrive.