This is well-worth tracking down.
Hoisted from comments:
Jonathan Goldberg: Talk of colorless green ideas is not necessarily incoherent. This was proven to me by a poem that served as the intro page to a volume of essays (to which, alas, I've lost the reference) on Philosophy of Language.
It was three or four verses starting with the conceit of a seed in winter as the idea of the tree it would become in the spring. The last line, of course, was "Colorless green ideas sleep furiously." By the time one got there it made perfect sense. Brilliant.