A set of Isetta paint samples that were recently on ebay from a seller in Germany. I would have loved to have these, unfortunately $168.87 was a little out of my price range.
More information on Isetta factory colors can be found on Bruce Fullerton's IsettaTech website. There is a chart in PDF format that list the 30 BMW Isetta factory colors that were available from 1955-1962. The chart includes paint names in German and English, the BMW color code, as well as the Standox and Dupont color codes. There are also samples of color chips here and here.