The first combo is more literal, the second shifts "prayers" to "blessings," but is more strictly a pair of antonyms.

For the first, there's Edgar in King Lear:

"And with this horrible object, from low farms,
Poor pelting villages, sheep-cotes, and mills,
Sometimes with lunatic bans, sometimes with prayers,
Enforce their charity. Poor Turlygod! poor Tom!"

(Where "bans" = "curses").

For "blessings / curses", this is from Tom Jones:

"...I will say boldly, that both religion and virtue have received more real discredit from hypocrites than the wittiest profligates or infidels could ever cast upon them: nay, farther, as these two, in their purity, are rightly called the bands of civil society, and are indeed the greatest of blessings; so when poisoned and corrupted with fraud, pretence, and affectation, they have become the worst of civil curses, and have enabled men to perpetrate the most cruel mischiefs to their own species."

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Note added at 13 mins (2010-03-14 22:50:41 GMT)
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No Prayers Or Curses - Double-click to Play

- From John Steinbeck's, The Grapes of Wrath

Here's from John Steinbeck, "The Grapes of Wrath":

"And when that crop grew and was harvested no man had crumbled a hot clod in his fingers and let the earth sift past his fingertips. No man had touched the seed or lusted for the growth. Men ate what they had not raised, had no connection with the bread. The land bore under iron and under iron gradually died; for it was not loved or hated it had no ***prayers or curses***."

So, you might as well use that literal version. Though you haven't said what your context is.

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Note added at 31 mins (2010-03-14 23:07:50 GMT)
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In your context, I think "prayers and curses" will likely work.

Drowning my sorrows in prayers, and curses...