I've always loved moss and lichen, even before gardening and plants became an obsession. Around here both usually go unnoticed, unless you're an astute observer of Nature or are a plant person. Or you're a rock person -- as I am.
The other morning when I was scraping together some frost photos before the early sunlight replaced the "frosty" description with plain old "wet", I happened to look up at the gutter above the deck. Imagine my surprise to see it dotted with lichen!