I'm playing with the palette that John Singer Sargent is said to have used. All warm colors, except prussian blue. The quick study has given me some ideas -- warm highlights in the hair, cool blue in the eyes -- but I'll be playing around with these colors for a while.
It's a huge shift for me -- the only color I usually use that's on this palette is naples yellow. Part of the reason is that it's largely a portrait palette, suited to people and indoor rooms/backgrounds. Also, some of the colors are more toxic/less stable than colors used today. Don't worry, I'm painting with gloves on.