I had changed my blog background to pink as I get bored of black for 1 and half year and new stuff will always hold my interest. However black is still is my favourite because it convey a touch of mystery and secrecy. Everyone has their own little secret which they may wish to conceal the secret forever from others. In the occult black also represents darkness, opposite of white. I believe no one is perfect in this world even the kindhearted person will have his darkness side when he is alone, any evil will reveal without sin I think but it doesnt mean he will bring harm to others. Don't doubt it, evil is inherent in heart of everyone.Anyway, it is depend on your own thinking and how you overcome it.