'Inspiration' to me is just an excuse to mimic someone else's work. I try to stay away from any inspiration.
But I usually try to fashion my sigs to fit their purpose, as well as their render. Of course, I don't have a wide array of techniques to call upon, so lately everything seems to be looking the same.
I hear you though, deep_dive. I used to work on graphics for hours at a time, almost everyday, and now even when I do feel like opening up Photoshop I usually don't keep anything I make.