Mix almond paste, syrup and marshmallow cream in a bowl and mix well. Add the sugar, a little at a time, until the mixture holds its shape. Let stand overnight. Add desired flavoring extract and knead the marzipan well, adding a little more sugar if necessary to make it retain its shape.
Break off chunks and form into shapes and sizes of your pleasure, using different colorings to suit the objects you're simulating. Roll in powdered sugar. Let stand until dry.