Why would you catch hell? You're solitary eclectic, right? it's your altar, and if it isn't disrespectful most of us would have no argument what you put on it. To me, the god/dess symbols would have to have some gender indication to be meaningful, but that's me. If the yin yang symbolizes the divine union for you then it's appropriate.
Actually, yin/yang might have gender associations in Chinese philosophy? I'll plead ignorance, I honestly don't know.