Why not look at just rainbow fish? here are some beautiful ones out there. They really make a stunning planed tank and are very active. The bosemanis and te red ones (I forgot the name). Look on you tube for "rainbow fish aquariums" Very pretty and unique.
thanks, aren't the red ones just called red rainbow fish or Glossolepis incisus? But that still doesn't answer my question about which color sand to use. Thanks for the comment anyway =)