Yo Yo Ma!
I also like “Aw, hamburgers!” from South Park’s Butters.
I’m fond of “good Ford,” or “oh, Ford” - but then, I refuse to admit that “Brave New World” is a dystopia. People are happy!
[Hermes]
Sweet llamas of the Bahamas!
Sweet lion of Zion!
Sweet three-toed sloth of ice planet Hoth!
Sweet bongo of the Congo!
Sweet Yeti of the Serengeti! She’s gone crazy-eddy in the heady!
Sweet guinea pig of Winnipeg!
Sweet gorilla of Manila!
Sweet manatee of Galilee!
Sweet giant anteater of Santa Anita!
Sweet squid of Madrid!
Sweet sacred boa of Western and Eastern Samoa!
Sweet honeybee of infinity!
Cursed bacteria of Liberia!
Great cow of Moscow!
Sweet lamprey of Santa Fe!
S-s-s-s-s-sweet something of… some place.
Sweet coincidence of Port-au-Prince!
Sweet topography of cosmology!
Sweet Georgia Brown of Kingston Town!
Sweet dodo of Lesotho!
Sweet tornadoes of Barbados!
Sweet File-not-found of Puget Sound!
Sweet Robot Swan of Botswana.
Sweet candelabra of La Habra, LaBarbara!
Sweet ego of Montego!
Sweet freak of Mozambique!
Sweet dehydration of every nation!
[/I love Hermes]
You can’t go wrong with “fuck a duck!”
Almost anything with “fuck” works.
I use this, and also “Good Gravy”
I’ve actually been saying that a lot lately. I have a former coworker who used to be really fond of it many years ago, and for some inexplicable reason I’ve picked it up. The spouse has looked at me very strangely a couple of times in the last couple of weeks. 
nvm
I say ‘Jinkies’ a la Velma from Scooby Doo.
Religious, I know, but one of my faves: Sweet nipples of Christ!
I usually alternate this with “butt fuck a reindeer!”
There are only three kinds of curses; those that reference the body and its functions, those that reference the divine realm, and those that reference heritage/parentage.
This makes it particularly difficult to find school-appropriate, nonreligious exclamations. Even things like “Jimminy Cricket!” and “Oh, snap!” are just euphemistic substitutions for “Jesus Christ!” and “Oh, shit!”, so those don’t count.
“Oh, my cow.”
My 7-year old grandson conflated “Oh, my God” and “Holy Cow” for the new expression. We loves it and “oh, my stars and garters” which I continue to try to bring back.
Why do we need a replacement expression?
I was trying to resolve a problem with my wife’s computer and actually deleted a file. It was irritating and I wanted to cuss, but just as I started I realized the situation wasn’t really all that bad.
“Aww, Frick and Frack!” I growled, then opened the recycle bin and restored the file.
My wife laughed. I knew it didn’t mean anything. I suspect part of it had come because I had seen a mention of Battlestar Gallactica on this site somewhere and remembered they used the term “frack” instead of ‘fuck’ on the original series.
Weeks later, my wife was playing a computer game and when her character died, she shouted at the screen, “Frick and Frack!”
I realized she had gotten the phrase from me because I had made it up. I raised an eyebrow toward her and said, “You got that from me.”
“Yeah.” she acknowledged, “Now it’s all over my office.”
Weird, eh?
—G!
*You might think you know what you thought I said,
but what you don’t understand is that what I said is not what I meant.
*
Holy flurking Schmidt
… but one of the perks of atheism is freedom to blaspheme all Goddamn day long. We don’t need a substitute.
Boutros Boutros Ghali!
The Land of Goshen was given to the Hebrews since Pharoah liked Joseph’s dream thing.
“Moses and Aaron on a stick!”
One of the nice things about Black girls is that they don’t say, “Oh. My. God.” but “Damn, girl.” 
“Oh My Heck!” is widely used in the Utah Mormon community.