On the left, is a vintage fabric and on the right, a Cath Kidston design from Christmas 2011.
(Both images can be found on my Pinterest board here)
Don't be precious - remember that unless you've been living a completely isolated existence, you've probably been inspired from something you've seen. Your designs are valued - just because someone is making something similar, don't discard your interpretation.
To those who see something lovely and think it's ok to copy, please make it your own. Put your own twist on it. Use the colours and fabrics that make your heart sing. Use the inspiration to make something which shows who you really are. Copying isn't nice. Copying is most definitely not cool.
And remember, if in doubt, put a bird on it.