Actually, the tools used tend to influence the design of the product, and within certain parameters there are only so many variations to work with. So it is not entirely unlikely that a ship you made could look like other that others have made.
In fact, many of the ships looked like a retrospective of the Concept Ships blog. Some of them are because there are commonalities in what people find appealing in such designs, others are clearly fan art, but most are harder to tell. I've found a Ferengi ship in the collection, but can't say for certain if that was the inspiration of that artist, or it was just a coincidence of a forward swept wing shape (which is why there were many that looked like Klingon birds of prey too).
On the other hand, some of the Minmatar ships already in the game look so obviously Star Wars inspired it isn't even funny. So who's to say.