Here's a quick post, I just more or less realised this and I'm sure there are many others out there who spout a similar message or have documented the proof using the scientific method, but here is my possibly unprofound suggestion:
Start every day by doing something creative.
I don't think it matters what you do -- draw a picture, paint something, take some photographs, write some music, whatever. Just do something creative to start your day. If this idea is too free-form for you, add a constraint: spend no more than 30 minutes doing something creative before continuing on with the rest of your day.