How to ensure that i am not copying others design?

Hi,

We all here in this graphic design industry know a term called as reference and we often use it when creating a art,just to make it correct or to take a inspiration for it.And we all come across lots of references and we see lots of images,designs that we record on our brains and as human behaviour we sometimes can make the same designs for a client of ours without knowing it. I am a graphic designer and have been come across this situation lot of the times and i know that many of you must also have came across it too.So how do you tackle this situation?

Please help.

I didn't find the right solution from the Internet.

References:

http://www.graphicdesignforums.co.uk/threads/how-to-ensure-that-i-am-not-copying-others-design.24968/

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Thanks