I have used left over pieces to make original stamps. Cut to one inch squares - or any size (I even used them for windows and doors for a third grade collage "Romarie Bearden" project) -- then glued to scrap pieces of wood. These are used with stamp printing ink for borders and more.
>>Now I wish the foam would come in 8 1/2 x 11 instead of 9 x 12. Anyone have any ideas >>on what to do with 8 1/2 x 1 pieces of this foam? It would be nice to hear from those >>who have used this material in some other way.