I tried this exercise with faces; I started by making a pattern so that each face would have the same shapes in it, but i couldn't do that easily with the features, so they were all cut freehand, but I made an effort to get them fairly similar in size and shape. Also, I decided to use the same basic skin color for all four because i thought it would allow the color combinations to be more effective. I don't know whether that's true, though.
Note that you can click on the picture to get a bigger version if you want one.
The effect of the blue hair in this one is I think a function of color: she looks much vaguer, more ghostly, or something.
It may have made more sense to have used only plain colors to get the full effect of this, but I don't have that big an array of plain colors. Finally, I don't know at all what to conclude from this exercise, although I liked doing it and I like the results. Mostly, I think it would be a lot easier to use wilder colors in people than I usually do...
(Another construction detail: I did use chromacoal (which is like colored charcoal) to give the faces some shadowing/color, although all the features are appliqued cotton, not painted on.) judy