A wise man once told me, "Freddie Fungus met Alice Algae and took a Lichen to her."
As a lover of English cottages, I realize that one desireable feature is lichen. I gives a mellow aged look to roofs and walls. When we remodeled this house, I faux painted some lichen-ish stuff on the window and door mouldings. But now I actually have some real lichen on the lamp out front. And I'm lichen it a lot. You can find more lichens here.