I came across the TechNought wallpaper I made. It, of course, turned out nothing like I was intending. But in the end I was very happy with the result.

TechNought V1 by ~dreadnought on deviantART

And although I often look back at things I made years ago and am unimpressed, I still really like it, and am using it once more as my wallpaper. 1024×768 seems too small to me now though.