Ladybird as lucky charm
What do you think of this:
Take some red and black carton and cut out a normal, nearly round ladybird with its few points. Now make two straight cuts into the back, big enough to clip a folded, small bill in between, so that only the number is to be seen. The amount of points of the ladybird should be the same as the number on the bill. To vary this idea: you could also build the ladybird bigger and the points would then be coins.