The Three Flavours Cornetto Trilogy

The Three Flavours Cornetto Trilogy (Or "The Cornetto Trilogy" for Short) (Sometimes called the "Blood and Ice Cream Trilogy") is a series of comedic genre films directed by Edgar Wright, written by Wright and Simon Pegg, produced by Nira Park, and starring Pegg and Nick Frost. The trilogy consists of Shaun of the Dead (2004), Hot Fuzz (2007) and The World's End (2013)

Recurring Themes
All of the films have recurring themes, here are as many as we could find:
 * Cornetto Ice Creams - A cornetto of each colour appears in each of the films. A strawberry one in Shaun of the Dead to signify blood, a classic cornetto in Hot Fuzz to suggest police, and in The World's End, a mint cornetto in a nod to aliens and sci-fi.
 * The Fence Gag.
 * The Arcade Machine Gag
 * Cameos - The Three Flavours Cornetto Trilogy is famous for having cameos of A-list actors, such as, Cate Blanchett, Bill Nighy, Pierce Brosnan, Peter Jackson and Chris Martin.