The "executive toy" type thing which is about 10 inches square, a frame that appears to be filled with blunt nails. You put your hand or nose or whatever into it and the imprint remains with all the "nails" pushed out.
We had one years ago from Camden market I think, I want to buy one for ds for christmas and I can't for the life of me think what to call it to google for.
This is the sort of wierd thing that mn usually comes up trumps with.