Fall colors shine on the dreariest days. Indeed nature photographers love cloudy days for the same reason portrait photographers use light diffusers. Clouds produce a warmer, softer light than direct sunlight, making reds, greens, and yellows pop, and lighting up nooks and crannies everywhere in the image. I took this photo last weekend in East Rock Park in New Haven after a half hour walk in the rain along Mill River, wishing I'd worn gloves. I really liked this view of one of the ridges with the new fall colors blooming up from the bottom of the frame.
Below is the google street view image of this scene