I had the opportunity to try them out today when I altered some dominos into little magnets.
As the rubber stamps are quite large, only the head and shoulders are on the dominos.
The orangey coloured one is my favourite and that happens to be the first one I did. I stuck some old book text onto the domino with gel medium (the text had been inked first with colour). Then rubber stamped the images over the top. I tried to lighten the colour of the faces with ProMarker pens, but I think the background colour was a little too strong.