The basis of civilization itself is the copying of ideas. In fact, that's one of the ways we can tell if one culture influenced another -- by the copying of that culture's ideas. We would not be able to produce photographs if we did not copy ideas.
With over 230 billion images on the internet, it is very unlikely you have a completely unique idea. People often tell me my sand images are unique. But they are not. There are variations of them everywhere. But I like to think I have put my own personal spin on this idea and made it my own, and in so doing, made it better.
Copying and building upon an idea is what art is all about. Art does not emerge into the world as a brand new entity. It sits on the shoulders of previous artists., build upon their ideas, copies them, and transforms them.
There is a big difference between copying an idea an building upon it and duplicating it for one's own recognition. The latter process may gain someone recognition in the short term, but over the years, these impostors always fall away. George Bush used Google Images to find photos of world leaders and turned them into paintings. Some of these images were copyrighted, and in so doing he violated the copyright. He gained some notoriety. Will he be regarded as an artist for this over the long term. I doubt it.
So if someone takes our idea and builds upon it, let's rejoice. It means we have added a brick to the great wall of art. If someone steals our image for personal gain, we have copyright law to help us out.