Dark Library tileset?

I was wondering if anybody knew where I could find a library tileset? Yes, I know about the one on the public tilesets page, but that one's just a bit too cheery for what I need. It doesn't need to be, like, Grim-Dark dark, but some muted colors with maybe some cobwebs and other things of that nature would be perfect.

I MIGHT be able to, but I can only do .png or .pdn (paint.NET) files.

Uh, .png isn't Paint.net only, right?

png is a standard image format. If you have a imaging program, it can (or at least should) open a .png

In fact, png is the only format tilesets are able to be in, since Knytt Stories only uses .png image files.

I MIGHT be able to, but I can only do .png or .pdn (paint.NET) files.

Would you? That would be nice.

Oh man, now I'm getting ideas for a Doctor Who Silence In the Library type level. That's not what this is for, is it? Because that would be awesome.

I don't know what you're referring to, but probably not; it's just going to be a library owned by a bunch of gloomy sorts.