More info here. In Shaun of the Dead, the color of the cone's packaging is red to symbolize the bloody nature of the film. In Hot Fuzz, it's blue to match the color of a police uniform. In The World's End, it's green to symbolize alien beings.
Cornetto is a posh brand of ice-cream in the UK that's in a waffle cone and has 2 types of flavoured ice cream and sauce. In scenes at the end of The World's End a wrapper can be seen stuck to the wire fence
