Yup. That's the question.
I don't want pictures, I want textures that type seamlessly or some kind of interesting graphic that doesn't distract.
I have a few good ones in my mac but I want more variety so I can change desk pics every once in a while

I like this site: Desktop wallpaper | Social Wallpapering

A nice Google search with keywords is in your future. Google >>> wallpaper,textures, background, dark, grey <<<

Stuff like that. I found a set of wallpaper called "Grey6". I think it was from someone on DEVIANTART.COM