Yeah, everyone knows Charmander is a fire-type Pokémon. But what if it evolved into a grass-type Charizard somehow? You can see that answer for yourself (and answers to many similar questions) thanks to the work of an artist who has created a variety of experimental swaps.
Kotaku compiled the images from Reddit by artist abz-art, so you can get some help imagining what Venusaur would look like as a water-type, or Pikachu as a dragon-type Pokémon.
If that captures your interest, then click the links to see more!