I discovered some old rolls of undeveloped film and had them developed. Among them was a roll of Fuji Provia 400 slide film, which was cross-processed in C41. Some of the images produced interesting results.
Here's the first one that caught my eye: A mundane bowl of fruit, that turned almost unnaturally vivid and displays a very pleasingly structured grain.
"Crossed Fruit" on Fuji Provia 400 cross-processed in C41.