What is going on over at Den gode feen's hobbyside brings up a great topic about copying others crafts.
As a crafter, I get TONS of inspiration I see on flickr and other people's blogs. There are so many great ideas, crafts I love but never would have thought about myself.
However, I think there is a difference between inspiration and copying.
Inspire: to influence, move, or guide
Copy: to reproduce an original work; something to be imitated
Many might think there is a fine line. Personally, I would never intentionally copy someones work, nor would I want mine copied (unless I specifically wrote a tutorial). But, if I inspire you to do something similar, and add your own take on it, by all means -- create.