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As long as you are creating your own designs and not trying to copy and sell somebody else's, that's totally fine. (I am thinking of doing the same with some Tarot ideas that I have).
LoL-Prometheus, I wanted to say the same thing along the lines of the 'ancient magi' also but didn't quite know how to word it but you did it perfectly.
Are astrology sign designs copyrighted? 
Ok, I have this idea that involved astrology signs, are they copyrighted? Do I have to get permission to use the signs on my designs?
Re: Are astrology sign designs copyrighted? 
Heavy Metal Art and more @ 
