The Now Habit: A Strategic Program for Overcoming Procrastination and Enjoying Guilt-Free Play suggests using an  Unschedule.

According
to the book, procrastination is “a symptom, a way of coping with deep
psychological self-criticism and fear… because we’re taught to believe
that working is good and playing is bad.” So on your Unschedule, you
schedule times for *only* non-work related things (like breakfast,
lunch, gym, social time, tv watching, recreation). The whole idea is
that when something is on a schedule it magically legitimizes your
personal time.

While the Unschedule is primarily designed to
promote more focused bursts of work amid acceptable down-time, I think
it could also work to “give permission” for creative pursuits.

From 43things.