Black is just not the colour for a football shirt. Along with grey and pink, it should be avoided.
I would not be averse to a mainly claret change kit, but it might defeat the purpose in that it would still clash with the likes of Aberdeen and Hearts. I have liked some of our blue kits, but, for me our best efforts have been white. I would also contend that there should be some claret and amber detailing on all our kit. They are our colours and we should always have them somewhere.
For future consideration, how about a shirt in dark green? I have always thought the South African rugby kit looked pretty cool and we could justify it with reference to the firs of Fir Park.