G'day,
For me inspiration can come from a colour somewhere, typography in a magazine or a promo spot on TV, like the new one on Ch2 at the moment, basically anywhere. Doesn't really apply to Alex's question, but maybe to apply it to it, it could come from a curve or shape on anything, then you see a chair and wonder how you could apply that yourself - at least that's how it works in my case.
Not that I make chairs, although I have turned one of our dining table chairs upside down and comented that I could make SWMBO 2 new ones to match, but I got told I've got too much else to do yet. Shot down in flames for trying, can't win anyway I try. :eek: