I've been avoiding making scenarios based on WWII because it's a cliche-storm, but here are a few ideas I've had. I haven't managed to totally avoid the cliches, and these scenarios do take a lot from previous works, but I think I can provide enough of a twist to them to make them worth making. As dystopia is my forte, these will all involve OTL's best representative of grimdark, the Nazis.
Endsieg - My take on the post-apocalyptic Axis victory scenarios. This time, instead of debating how Nazi Germany and Imperial Japan developed, I choose every option and have their shattered empires develop in different ways. And, of course, gratuitous servings of Weird War elements. The feudal, genetically-modified Himmlerites of Burgundy face off against the undead legions from the irradiated and damned heartland of the old Reich. A revived shogunate and their samurai endeavor to maintain control of their Chinese and American territories, while being attacked by IJN and IJA warlords using leftover WWII weaponry to keep on fighting WWIII. And of course, on the dark side of the Moon and deep in the Mariana Trench, the remnants of the German and Japanese governments plan their triumphant return.
The New Order - A 1940s-punk scenario. In the 2040s, World War II burns on, or rather its embers still glow in the darkness. The Eurasian continent is under the domination of the Third Reich, although Germania's hold beyond the Urals and Caucasus is very tenuous. The Japanese Empire has fallen, consumed by Germany's newly-industrialized wartime ally, Nationalist China. Both factions fight one another in Central Asia and resist the United States of the Americas, a pseudo-monarchy under the Roosevelt family, who support the bloodthirsty Free European guerrillas in Africa and occasionally launch ballistic missiles at occupied Europe from their base in what the Americans refer to as Airstrip One.
Under the Jackboot - A fascist world, where most major fascist movements have succeeded. As Europe is divided against itself, these divisions occasionally breaking out into outright warfare, the American Union and Imperial Japan fight proxy wars around the Pacific and South America. Still not too sure about how to organize this one, so I'm open to ideas, but I'm fairly confident that the Nazis won't be dominating Europe this time around, but would be one of many batshit states in Europe.
A Very British Civil War - Based on the tabletop RPG of the same name, a world where King Edward VIII does not abdicate and does such improper things as marry a divorcee and appointing Oswald Mosley of the British Union of Fascists as his Prime Minister. This scenario focuses on the aftermath: Britain remains a fascist state under the dominance of the Greater German Reich, which was instrumental in allowing the King and the BUF to triumph in the British Civil War. The United States (which did not enter the war against Germany directly) and a rump Soviet Union, backers of the defeated British governments, continue to contest German domination of continental Europe and support the governments-in-exile scattered around the world.