I just learned a wonderful new word, thanks to my e-mail subscription to A.Word.A.Day:
DARKLE: To make or become dark, indistinct, or gloomy.
Kind of the opposite of sparkle, and the words rhyme!!! So great! I'm going to really try and integrate this word into my everyday vocabulary.
Heavy clouds hung low as the sun set; the sky quickly began to darkle and the streets of the village quieted.
That's my practice sentence, I think it works, right?