Mash up two canons based on their titles. The Golden Compass Girls...Ender's Game of Thrones.
Change one letter, get a new canon. Star Bars...Evolutionary Girl Utena...Post (about an island of misplaced mail).
Fusion between things with similar names: Mad Men: Fury Road...The Boardwalk Empire Strikes Back To The Future...The Princess Tutu Diaries.
Invent a crossover by title: Dancing with the Star Wars...Jurassic Parks and Recreation...Guardians of the Galaxy Quest.
Change a letter, get a new work: The Vorkosingan Saga (it's a Eurovision AU)...Les Minerables (a Steven Universe AU)...Person of Pinterest...Loft.
Change a letter, get a new work: Sass Effect...The Block Jewels Trilogy (it's a Tetris crossover!)...Funding Dory.
Change a letter, get a new work: The Imperial Ranch series (Anaander Mianaai retires to Wyoming and raises cloned sheep)...The Neverending Store (like Costco or Sam's Club, but more)...Captive Pince (the harrowing account of a siege in the Hogwarts Library).