But from my ignorant little nook here, I would say that practically anything can be a source of inspiration. That is the nature of inspiration, one idea begets others. I would say that the samurai have such a rich and colored history, not to mention so many modern interpretations, that they would be a rewarding choice. The only constraints, should you choose to accept them, would be remaining true to historical origins, religious doctrines, etc, that bear import for samurai, i.e. not abusing or defaming their origins unduly.