Permit the use of pigments with dice to color both the pips and the die itself. Perhaps improve the die image somewhat (though presently it works acceptably) so that die can be colored as well as used in various games of chance.
Introduce cards in decks of any number. Allow players to use sketches to choose a back for the card, as well as a sketch for the front image. Cards can be removed or added to a deck at will, will permit the creation and sale of in-game playing card decks with custom images, tarot cards for fun and profit, and general LARPiness.
Potentially expand this idea to include a table where card games can be played. No rules, just a place to set down x # of cards and let the rules be adjudicated by those playing.
Also -> Chess boards where each set can be made from a stone of the builders choice, boards determine the 'frame' color, and two types of stones determine the black/white color.