I created the kamon symbol in Illustrator and put the wallpaper together in Photoshop.
This is the kamon featured on some publications of the Hagakure (a kamon is a Japanese family symbol, like a coat of arms) and on the cover of the Ghost Dog DVD.
I’ve tried to find what association this kamon has with Hagakure and it seems there isn’t one except a publisher though it looked cool on the cover of the book. This isn’t the kamon of Yamamoto Tsunetomo as far as I know, or his retainer Nabeshima Mitsushige (his looks very different). I’ve also seen it associated with bushido.
Anyway, see Ghost Dog and get the soundtrack by RZA.
…and read the Hagakure if you dig ancient samurai wizdom (there are free PDF versions via Google).
I created three versions of the wallpaper all available for download from my deviantart gallery: