I'd say the rainy days are best if you want to go greeeeen
Here's my entry for Natural Framing assignment, its actually Frame^-1
Exif Data
Exposure : 1/60 sec
Aperture : F/5.6
Focal Length : 55mm
ISO Speed : ISO-1600
Exposure Bias : 0EV
Flash : Natural Lighting
Camera : Canon Rebel XT