cards without colours. it allows people to still play escalating, but without the luck portion of wondering if you will get a cashable set after 3, 4 or 5 cards.
I think it would go down very well with the more skillful player who think the dice already put enough of a 'fluke' aspect into the game.
Still allow peple to hold up to 5, so it involves the skill of knowing when to play them.