When I am trying to unwind I usually take the scale down a few notches, pull out a paper pad and markers and play around with color and composition. The size and media relieve some of the pressures that come with a larger surface (wanting it to be good, for instance) plus getting to complete a composition and cover a surface in 30 minutes rather than 6 hours is a lot of fun. Occasionally these smaller drawings will vaguely inspire a painting or, even rarer, get reproduced in large-scale, but I'm just not much of a planner when it comes to painting and that's really not the point.
One goal I have is focusing a bit more on showing off the smaller-scale side of the studio, as I've rarely shown any of the hundreds (if not thousands) of works on paper I've done over the years in between larger paintings. It's not that I didn't think they were worth it, I've just always been a bit more excited to show and make larger scale stuff. But as i've been drawing more and more lately, I'm rediscovering the passion for the smaller scale and there's something unique that comes with the immediacy of drawing.