This subject has been talked to death. Every time I see some kid accusing someone of "stealing" their idea I have to tell them this. Now that doesn't mean that there are no truly original memes. Because there surely are. Typically of the custom variety. But usually the more common ideas and subject matter are ideas that anyone can have and many people do have, and many of those people put them into memes. It does annoy me when I see people acting as though some massively common sentiment placed on some massively popular template is somehow an idea that only they could have ever thought of.