If you want to give a quick Autochome look to some images download this LR Autochrome Preset to get you started. Change the grain settings to suit the size of your reproduction.
Before Autochrome Preset:
After Autochome Preset:
If you are interested in changing the labels on the IPTC metadata fields shown in Lightroom's Library module (or displaying fields other than the default fields) you can find details on how to do this on my blog at mraggett.wordpress.com