After the are allowed to dry, the air is slowly released out of the balloon, otherwise the chocolate will probably break.
These are chocolate cigars, milk chocolate is drizzled on marble, and then dark chocolate is smoothed over the top, after it has cooled slightly a knife is dragged across it creating a curl.
The same can be done by making dots on the marble in white chocolate, and then covering with dark chocolate.
The chocolate garnish like on the roulade is made by coating a piece of plastic in chocolate, scraping it, and then curling it and leaving it to cool, once it's cool it taken off the plastic and used.