Inspiration to create? Or, create for inspiration?

I'm not really a believer in the supernatural but I do enjoy checking my horoscope. Yesterday, my horoscope (credit to Sally Brompton of The Globe and Mail) said this:

Don’t waste time on trivial things or petty vendettas. On the work front, especially, you have important tasks to complete and every minute between now and the end of the week will be vital. Get serious about your ambitions.

I do indeed have a lot of work to complete this week in preparation for a group art show on December 8. This horoscope made me think about people who 'create'. Do you wait for inspiration to strike before you create? Or, do you create and hope that the process of creation will inspire an idea to develop?