I'm such a sucker for old superheroes and retro games that these Pixel Nostalgia posters by Brazilian Boo! Studio are a perfect storm of melancholy and awe to me. Looking at them makes me long for an Avengers or X-Men adventure game—one made by ex-Lucasarts' Ron Gilbert, Tim Schafer and Dave Grossman. Check out their huge poster:
You can buy it here.