Cold mornings might not be fun for commuters but it does mean photographers get the chance to photograph frost before the sun thaws everything through.
You can pick up multiple clip-on lenses as a kit, or just shop for ones that conform to your particular interests: macro for close-up work, telephoto for action, anamorphic for filmmaking, and so on.
I've also been seeing a growing number of ‘macro’ tilt-shift lenses that 0.5x or even full 1.0x magnification at their closest focus setting. These lenses therefore work very well for extreme close-up ...