Every day that I've been teaching in Singapore, I've done a quick (2-10 minute) page with really dreadful oil pastels. The colors are an uninspiring student grade, the texture is not great, and the paper is cheap.
But it's fun to play, if only for a few minutes at the end of the day. When you paint quickly, without thought, your hands and eyes tell your heart how it is feeling. It's not great art but more like a dip in the pond to refresh before bedtime.