I see the Google ads are currently God Loves You and the Jesus Homepage...

A useful one is 'Kinell - the fuc has been dropped. Much exasperation can be expressed simply by extending the second syllable into a long whining moan.

Then there's Blood and Stomach Pills, from a proprietary medicine (occasionally Blood and Sand).

I knew a Scottish lad who set about finding the most inoffensive phrase he could use as an oath, and settled on "Hair Oil" as being the least satisfying thing one could say at times of stress.

LFF