The phrase "an endless source for" is correct and usable in written English.
It can be used to describe something that provides an unlimited supply of information, inspiration, or resources.
Example: "The internet is an endless source for knowledge and entertainment."
Alternatives: "a limitless reservoir of" or "an infinite supply of".
The style and topic of sculpture provided an endless source for the debate, criticism, reproduction and condemnation that filled the pages of the press.
The search for perfection or a situation with greater power, greater convenience, greater inspiration or an endless source for our own happiness, is unrealistic and can be very painful.
The mechanical behaviour of biological tissues has been studied for decades, and the knowledge gained has been an endless source of inspiration for the design of novel composite materials.
Galileo's life has been an endless source of fascination for artists of course.
Best thing about it It proves that when presented creatively, science is an endless source of fascination for children.
More recent works on paper suggest questions about artists' psychological motivations, providing an endless source of inquiry for art historians.
It also recalled the student and worker strikes of May 1968 in Paris, an endless source of fascination for contemporary artists.
Kate loved the Cape and her boundless love, like the ocean she cherished, was, and will continue to be, an endless source of strength for us all.
Unfortunately, when I was growing up, having breakfast in a restaurant with my parents was an endless source of embarrassment for my sister and me.
Jimm's increasingly addled mother, called Mair, has abruptly decided that the family should move south to run the Gulf Bay Lovely Resort and Restaurant, a forlorn dive that is an endless source of wisecracks for this story.
