Well, I tried throwing in my own texture pak, and now I know why they didn't accept it.
XML, I personally say, the hell with. Those standards can byte (I was going to edit this post to say, 'bite', but on second thought....) my ass; I'll write my HTML how I want, silly excessive text. Last language I ever plan on learning for now.
And no, they were originally dumped by Rice's, but I modified them with ArtIcons anyway. File name should still be MD5.