I've always used 'old saws' or sayings. When my kids were growing up I used them as teaching tools. Once in awhile, I'd have to tell them I didn't make that up. Sometimes I did. If they'd do something I'd tell them not to do, I would adapt something they would relate to, i.e., then don't cry for me Argentina, or there's gonna be big trouble in Little China.
Between the devil and the deep blue sea - I like that one. I have always loved The Wave painting and recently bought this 3D postcard that moves the water around.
Love is blind... Oh, how we could all have heard that more. A few others I have used ~
Devil is in the details
Waste not, want not
Measure twice, cut once (I thought my husband was going to have a stroke when I used that one on him.)
There are literally thousands and not just in English. For instance, kick the bucket, means to die. It is humorous, in a slightly disrespectful way. Kind of. The version in Arabic, wad'aa" means, he said goodbye (sounds kind of sad.) Reminds me of 'whadup'. In Lithuania, instead of kick the bucket, they say, pakratyti kojas,
or to shake the legs (doesn't sound quite as funny.)
In this computer age, they have become common, in the form of memes.
BTW ~ It took me years to figure out what a meme was. LOL meant lots of love, or so I thought. I'm hopelessly ignorant of modern day lingo or computereze.
What are some of your favorite idioms? I know you have some, or is it just a generational thing?