http://www.orkneyjar.com/archaeology/nessofbrodgar/july2610.htm
Exciting stuff wideford - thanks! I got this link but the first one wouldn't work for some reason. The last line here rang a bell as I'm sure that possibility was mentioned years ago on TMA.
Although many archaeologists believe that the monochrome prehistoric world revealed through excavation must have been in truth techni-coloured – what these discoveries do, is bring these beliefs into sharp relief and reveal a multi-coloured Neolithic world where colour was not limited to perhaps personal adornment, clothes and artefacts but was also used to decorate structures (perhaps even as Chris imagined above standing stones?).
