I really like taking pictures of the sky. Springtime seems to bring a lot of dynamics to the heavens. Post processing can really go a long ways with skies. So I am attaching a preset that I created for stormy skies. Download this and try it out, if you have Lightroom.
If you don't have lightroom, play around with the tone curve (increase the lights), give it plenty of contrast, a little vignette, and increase the blacks a touch.
Here is the before:
And the after:
Pic of the Day -- I really like the evening light on this... and the composition lends a lot to the aesthetics as well.