Once you understand it -- that it is you, the person, who is creative or uncreative -- then this problem that many of us create that we are "uncreative" or "not creative" disappears!
Not everybody can be a painter - and there is no need also. If everybody is a painter the world will be very ugly; it will be difficult to live in, paint would be everywhere. And not everybody can be a dancer, and there is no need. But everybody can be creative.
Whatsoever you do, if you do it joyfully, if you do it lovingly, if your act of doing it is not purely economical, then it is creative. If you have something growing out of it within you, if it gives you growth, it is spiritual, it is creative.
Mindfullness Meditation is the practice of fully diving into whatever it is you are doing - not at 20%, 50%, or 75%, but 100% of your attention on this very moment - choosing your outfit, shoes, clothes, painting your face, putting on the wig, enjoying the warmth of your friends or family in the setting you are in. With no expectation!
This is your time to be creative. Let your practice this Halloween be finding the moment, submersing yourself into being completely mindful of it, and this creativity in everything you do. This is Mindfullness Meditation Modern style.