When you discover your work has been copied it is hard to feel flattered. I recently discovered some work that was remarkably similar to my own, and felt a bit cheated. I have taken it upon myself to not feel too terrible about it, as the person is a student and it appears to be an experiment in shape and colour. When I was studying, and even now, if I am inspired by someone’s work I will always try to learn from it and make an idea my own. It is called development, and it can be hard to do if all you will do is out-rightly copy peoples work. If you do ever feel it is important as part of you personal development to copy in some way, then please, please, please reference the artist/designer in some way! It makes the world of design a much nicer place, where we can all co-exist in mutual respect!