I've been looking into copyright a bit, and I feel a lot of it comes down to 'Are you trying to make money out of someone else's design?' or 'Are you trying to pass off someone else's original design as your own?' The answer to the first question is usually quite easy to work out. The second question is also fairly easy, but can depend on circumstance, especially if you enter your work into competitions - it can be the 'acknowledgement' or 'lack of' on the label that could get others muttering and again is it for sale or for private enjoyment.
Take for instance Ricky's Rhapsody quilt style, which is designed in a very similar method to Hawaiian quilts. It is entirely possible that a quilter in UK who has never heard of Ricky, but knows the Hawaiian style could come up with something similar to Ricky's Rhapsody all by her/himself. Is that copying? or inspired by? or what?
Sometimes we are inspired by something we saw years ago and had forgotton, but then are reminded by seeing certain colour combinations, and not realising it re-design something very similar to the original, despite there having been several years since seeing the 'original' - it can be very difficult keeping track on what our original source of design was sometimes.
As for colour combinations, just think about the recent exhibiton in NY of only Red and White quilts, none of them were copies, but they were all the same colour combination, and there were
hundreds of them
I think I have been rambling a bit here, probably a bit sideways from the original topic (so what's new there, then
) But I hope it gives some food for thought.