Who make these MyLot headers?

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I was looking to the computer from afar and I thought the site looked familiar but where was that from, that's when I realized it is one of MyLot's interests. They absolutely gorgeous, they fit and all (I was a webdesigner in free time), who make them? Cause I heard the other day users are the ones making the banners? Sorry, these are two questions, headers and banners, who are making them?